Renner Corner SD Duct Services: 3 Top Sealing Methods

*Estimated Read Time: 9 minutes* Leaky ducts waste energy, create rooms that never feel right, and pull dusty air from attics and basements into your home. If you are researching duct sealing methods, you are in the right place. In this guide we cover three proven ways to seal your ductwork, how to avoid common mistakes, and when professional airflow testing is worth it for long‑term comfort and savings. ## Why Ducts Leak and Why It Matters in Sioux Falls Area Homes Most homes lose 20 to 30 percent of conditioned air through leaky ducts. In our region, that means hot, humid summers and windy winters push your system harder while leaks waste money. Common culprits include loose takeoffs, unsealed plenum seams, gaps at the furnace cabinet, and aging UL‑unrated tapes that have dried out. What you feel day to day: 1. Rooms that never match the thermostat. 2. More dust and allergies from crawlspaces or attics. 3. Long run times and higher bills. 4. Noise from whistling leaks and imbalanced airflow. A key point many miss: sealing without measuring can backfire. The right approach starts with airflow testing so you fix leaks and preserve proper static pressure and return/supply balance. ## Method 1: Mastic + Fiberglass Mesh for Lasting Seals Water‑based duct mastic reinforced with fiberglass mesh is the gold standard for sealing joints, seams, and small gaps on metal and fiberglass ducts. It stays flexible, adheres to galvanized steel, and resists the dry‑out that kills ordinary tapes. Where it works best: 1. Elbows, takeoffs, panned returns, and longitudinal seams. 2. Around collars on supply trunks and at the plenum. 3. On transitions that move or vibrate slightly. How to apply it well: 1. Clean and dry the surface. Remove old cloth or rubber tape. 2. Press mesh over larger gaps. Butter the mesh with a 1/16 to 1/8 inch coat of mastic. 3. Feather the edges and let it cure fully before running the system. Done correctly, mastic seals are durable and airtight. Pairing this with proper return sizing preserves static pressure so rooms get the airflow they need. ## Method 2: UL 181 Foil Tape for Clean, Code‑Compliant Joints High quality UL 181 aluminum foil tape is excellent for straight seams and smooth metal joints where a neat finish is desired. Unlike generic “duct tape,” UL‑listed HVAC foil tape uses an acrylic adhesive that stands up to temperature swings. Best practices: 1. Choose UL 181A‑P or UL 181B‑FX depending on the duct type. 2. Clean, degrease, and de‑dust the surface. A quick wipe with alcohol helps. 3. Use a squeegee or roller to eliminate air bubbles and ensure full contact. Use cases: 1. Long trunk line seams where mastic would be messy. 2. Sealing after a minor adjustment to a fitting. 3. As a finishing layer over mastic at high stress points. Foil tape looks tidy and speeds up work, but it is not a cure‑all. On moving joints and irregular gaps, mastic with mesh still wins for longevity. ## Method 3: Mechanical Refit + Seal at Critical Connections Some leaks are a symptom of poor assembly. In these cases, the right “sealing method” is a mechanical refit followed by sealing. That means re‑screwing a collar to the trunk, re‑crimping a fitting, or replacing a bent transition so the joint actually fits. Then you lock it down with sheet metal screws and finish with mastic or UL 181 foil tape. Targets for refit: 1. Loose or undersized takeoffs that never seated correctly. 2. Plenum connections at the air handler that vibrate loose. 3. Return drops that were panned or cobbled together. This approach reduces noise, improves airflow direction, and gives sealants a proper surface to bond to. It is often the fastest way to eliminate the worst leaks for a big comfort gain. ## The Airflow‑First Rule: Measure Before You Seal Effective sealing protects comfort and equipment. But you must confirm the system can breathe. At DRG Mechanical Inc we start with an airflow and duct test that includes static pressure, return and supply balance, and filter fit. These numbers guide decisions so sealing does not choke the blower or starve rooms at the end of long runs. Our process also verifies cabinet seals and airflow direction. We size and label every cabinet so future filter replacements are simple and mistake‑free. This matters because high‑MERV filters and sealed cabinets can raise pressure. Without testing, you may fix a leak but create a new restriction. Two hard facts you can count on here: 1. We measure static pressure, return sizing, cabinet dimensions, and blower configuration before recommending any filter or sealing upgrade. 2. Comfort Club members receive two included complementary maintenance visits per year, which helps keep ducts, filters, and airflow in tune. ## DIY vs. Pro: When to Tackle Duct Sealing Yourself You can absolutely handle simple sealing if the ducts are accessible, clean, and metal. Focus on visible seams, short runs in basements, and around the furnace cabinet. Use mastic with mesh for gaps and UL 181 foil tape for straight seams. Call a pro when: 1. You cannot access key areas like concealed returns. 2. There are comfort complaints in specific rooms that suggest balance issues. 3. You plan to upgrade filters or add IAQ products that could affect pressure. 4. You notice rust, crushed ducts, or signs of past water damage. In Sioux Falls and surrounding towns like Brandon, Harrisburg, and Tea, homes vary widely. A quick professional test can pinpoint whether sealing, a return modification, or a cabinet upsizing will deliver the best result. ## How Sealing Interacts With Returns, Filters, and Zoning Sealing is only one lever. Many homes benefit more from improved return air pathways and properly sized filter cabinets. If your filter is undersized, sealing can raise total system pressure and reduce airflow. The fix may be a larger, low‑resistance cabinet plus sealing. On remodels, HVAC ductwork modifications or zone additions can further balance rooms without overworking the blower. Smart sequence: 1. Test static pressure and room‑to‑room balance. 2. Correct returns and filter cabinet size if needed. 3. Seal ducts and cabinet seams. 4. Verify results and label the cabinet for correct filter replacements. This measured approach protects efficiency and comfort, especially in larger two‑story homes with long trunk lines. ## Common Sealing Mistakes to Avoid 1. Using cloth “duct tape.” It fails quickly and leaves a gummy mess. 2. Sealing without cleaning. Dust and oil prevent adhesion. 3. Ignoring the furnace cabinet. Leaks at the air handler can be the biggest. 4. Over‑sealing flex duct. Crushed or kinked flex needs correction, not more sealant. 5. Skipping screws on joints. Mechanical fasteners stabilize the connection so mastic and tape last. A final tip: document the filter size and airflow direction at the cabinet. Clear labels prevent costly mistakes during future filter changes. ## What Results Should You Expect After Proper Sealing When sealing is combined with right‑sized returns and a cabinet that fits the filter, you can expect steadier room temps, quieter operation, and lower runtime. Many homeowners report less dust near supply registers and fewer hot or cold spots. The biggest wins usually come from sealing near the air handler, improving returns, and fixing obvious trunk line leaks. If you enroll in seasonal tune‑ups and safety inspections, these gains persist. We check pressure, filter fit, and cabinet seals twice a year to catch issues before they show up on your bill. ## Our Evidence‑Based Process for Lasting Results Here is how we approach duct sealing and airflow improvements for long‑term value: 1. Home comfort analysis and load calculation to right‑size recommendations. 2. Airflow and duct testing that includes static pressure, return and supply balance, and filter fit. 3. Itemized, no‑pressure options. We explain what to seal, what to refit, and what to resize. 4. Licensed technicians complete the work and verify results with measurements. 5. We size and label your filter cabinet and confirm airflow direction so maintenance stays easy. This process prevents guesswork and keeps your system within manufacturer and code requirements. ## What Homeowners Are Saying > "Brian Meffert is always so professional and does excellent work! We needed his expertise and insight to determine if a floor vent could be moved during a floor refinishing project. His recommendation helped us resolve the questions we had to keep the project moving forward. Thank you, Brian and DRG!" > –Homeowner, Sioux Falls Area > "I have used DRG for many years, probably close to 15 years. They have serviced my AC and furnaces also put in a new furnace at my old home near Harrisburg. All the guys have been professional and did a good job. I have recommended them to other people. Today Nate came to inspect my furnace and also put in a new filter. As usual this young man did a great job and with winter coming on I feel confident there will not be any problems." > –Homeowner, Harrisburg > "Recently had them in my home to look into a humidifier issue. Did a full service of everything while they were there... He got it all done and even showed me more features on the existing thermostat I didnt know was part of it. A+ work! Thanks Guys!" > –Homeowner, Sioux Falls > "Del's service to our A/C and Heating is always great!! Today was the heating system and he adjusted the humidity setting so we'd be more comfortable this winter." > –Homeowner, Brandon ## Frequently Asked Questions ### Can I use regular duct tape to seal my ducts? No. Cloth or rubber “duct tape” dries out and fails. Use UL 181 aluminum foil tape for straight seams and water‑based mastic with fiberglass mesh for gaps and irregular joints. These products are designed for HVAC temperatures and pressure. ### Will duct sealing improve airflow to the far rooms? Often, yes. Sealing reduces losses and can help, but the biggest gains usually come from fixing return restrictions and ensuring the filter cabinet is properly sized. Testing static pressure and balance identifies the right mix of fixes. ### How long does mastic last on ducts? When applied to clean metal, reinforced with mesh on larger gaps, and allowed to cure, mastic provides a durable seal that lasts for many years. It resists temperature swings better than generic tapes. ### Is duct sealing a DIY project or should I call a pro? You can DIY accessible seams in basements or utility rooms. Call a pro if you have comfort complaints, concealed returns, crushed ducts, or plan filter or IAQ upgrades. A professional test protects airflow and equipment. ### Do I need to replace my ducts to fix leaks? Not always. Many systems improve with targeted sealing, return modifications, or a larger filter cabinet. We inspect the system first, then recommend the least invasive solution that delivers balanced airflow and efficiency. ## In Summary The best results come from a measured plan: test airflow, fix returns and filter fit, then seal ducts with the right materials. For homeowners searching for duct sealing methods in Sioux Falls, Brandon, Harrisburg, and nearby towns, our airflow‑first process delivers comfort without guesswork. ## Call to Action Ready for airtight comfort? Call DRG Mechanical Inc at (605) 202-8996 or schedule at http://drgmechanical.com/. Ask about our Comfort Club with two included complementary maintenance visits per year for ongoing duct and airflow peace of mind. Call DRG Mechanical Inc now at (605) 202-8996 or book online at http://drgmechanical.com/ for an airflow and duct test that checks static pressure, return and supply balance, and filter fit. Serving Sioux Falls, Brandon, Harrisburg, Tea, and nearby. About DRG Mechanical Inc Locally owned and rooted in Northwest Iowa, DRG Mechanical Inc brings licensed, insured, and certified technicians to every job. We combine HVAC, plumbing, geothermal, and water treatment expertise with a no‑pressure process and honest recommendations. Homeowners choose us for airflow‑first diagnostics, 24/7 response, Comfort Club perks like two included complementary maintenance visits per year, and clear code‑compliant workmanship that lasts.

Rock Rapids, IA Duct Services: Replacement Costs Guide

*Estimated Read Time: 9 minutes* Stressed about air duct replacement cost and not sure what a fair price looks like in the Sioux Falls area? You are not alone. In this guide, we break down real-world ranges, what drives pricing up or down, and how to avoid paying for work you do not need. We will also show you how our airflow-first process prevents costly mistakes and keeps your home comfortable and efficient. ## What Drives Air Duct Replacement Cost Ductwork pricing is mostly shaped by scope. The more linear feet and fittings, the higher the price. Design complexity adds time, and access limits how quickly a crew can work. Material choice, code requirements, and testing also influence the final invoice. Key cost drivers: 1. Home size and layout - Ranch with open basement is fast and straightforward. - Two story with tight chases takes more labor and fittings. 2. Access conditions - Crawlspaces and attics slow installation. - Finished ceilings require careful demo and patching. 3. Material and insulation - Galvanized metal, flex duct, or ductboard have different costs. - Insulation values must meet code in unconditioned spaces. 4. System design - Number of supplies and returns, trunk sizing, and zoning. - Extra returns or larger filter cabinets improve airflow. 5. Testing and balancing - Proper static pressure testing and air balancing add time but ensure comfort. > “The team at DRG are quick, courteous, and do what is right for the customer.” ## Typical Price Ranges in the Sioux Falls Area Every home is unique, but these ballpark ranges will help you plan a budget: - Per linear foot installed: 15 to 40 dollars including materials and labor for typical residential metal and insulated flex combinations. - Small replacement or partial rework: 1,200 to 3,000 dollars for short runs, a trunk modification, or adding returns. - Whole-home duct replacement for an average 2,000 square foot home: 2,500 to 7,500 dollars depending on access, design, and materials. - High-complexity projects with tight chases or extensive drywall work: 8,000 to 12,000 dollars. Helpful guideposts: - Additional return runs: 300 to 800 dollars each depending on length and grille size. - Filter cabinet upgrade and right-sizing: 250 to 600 dollars including labeling and seals. - Zoning controls and dampers: 1,500 to 3,500 dollars per added zone. - Insulation on ducts in unconditioned areas: 1 to 3 dollars per linear foot to meet local code. - Testing and balancing package: 200 to 600 dollars and worth every penny for comfort. Sioux Falls homes often have basements with supplies run through floor joists. 1960s and 1970s ranches may have undersized returns that raise static pressure. Expect costs on the lower end for open basements and the higher end for attic or crawlspace projects. > “We needed expertise to move a floor vent during refinishing. The recommendation helped us keep the project moving.” ## Replace vs Repair: When You Do Not Need New Ducts You do not always need new ducts. Many comfort and noise issues come from a few choke points rather than a failed system. Smart fixes before full replacement: 1. Add or enlarge returns to lower static pressure. 2. Upsize the filter cabinet for a less restrictive filter. 3. Reseal cabinets and transitions to stop leaks. 4. Correct flex duct kinks and long unsupported runs. 5. Balance dampers to even out hot and cold rooms. At DRG Mechanical, we start with airflow, not guesswork. Our technicians measure static pressure, check return and supply balance, and verify filter fit. Often we improve comfort by modifying returns or upsizing the filter cabinet rather than replacing everything. That approach saves money and protects system performance. > “They did a full service of everything, solved the issue, and even showed me features on the thermostat I did not know I had. A+ work.” ## How We Calculate Your Price: Testing and Right-Sizing You deserve a price that reflects your exact home. Here is how we build an evidence-based proposal: 1. Home comfort analysis and load calculation - We right-size equipment and ducts to your home. Matching capacity to the structure prevents noise, drafts, and short cycling. 2. Measured verification - We test static pressure, return sizing, cabinet dimensions, and blower configuration before recommending a filter upgrade or duct change. 3. Duct layout and material plan - We choose metal, flex, or ductboard strategically for airflow, sound, and access. 4. Code and insulation requirements - We specify insulation levels for any ducts in unconditioned spaces. 5. Transparent line items - You see materials, labor, testing, permits if required, and finish work called out. Hard facts that protect homeowners: - The U.S. Department of Energy reports typical duct systems can lose 20 to 30 percent of conditioned air through leaks and poor connections. Tight seals and verified static pressure matter for comfort and bills. - Our Comfort Club includes two complementary maintenance visits per year, plus 15 percent off repairs and 10 percent off indoor air quality products. Routine service preserves airflow and keeps new duct systems performing. ## Line-Item Breakdown: Where the Money Goes Understanding each component makes comparing bids easier. - Design and layout - Duct sizing, run counts, and register selection. - Good design reduces noise and evens temperatures. - Materials - Trunk and branch ducts, takeoffs, boots, registers, dampers, mastic, and hangers. - Labor - Removal, fabrication, installation, sealing, and cleanup. - Insulation - Required for energy code compliance in unconditioned spaces. - Testing and balancing - Static pressure readings, airflow checks, and final adjustments. - Permits and inspection if required by your jurisdiction - We coordinate with local authorities when needed. - Drywall or finish work - Only if chases or ceilings are opened for access. - Disposal - Safe removal of old materials and jobsite cleanup. Tip for apples-to-apples comparisons: - Confirm the filter cabinet size and MERV guidance are included. - Ask if static pressure and balancing are in the scope. - Check that returns are sized for the new system. ## Zoning, Returns, and Filter Cabinets: Upgrades That Pay Off If your main level is perfect but bedrooms run hot or cold, zoning can make a big difference. We often add a second zone with automatic dampers and a dedicated thermostat. That upgrade carries a cost but pays back in comfort and run-time control. High-value upgrades: 1. Additional returns in long hallways or large rooms to stabilize pressure. 2. A larger, correctly labeled filter cabinet for easy, mistake-free filter changes. 3. Balancing dampers on select branches for fine tuning. 4. Shortening long flex runs and adding supports to cut noise. These improvements are modest in cost compared with replacing the entire system, and they often unlock the performance you expected from your equipment. ## How Long Does Duct Replacement Take and What to Expect Most partial replacements take one day. Whole-home projects take two to four days depending on access and finish work. What to expect: 1. Pre-job walkthrough and protection of floors and furnishings. 2. Removal of old duct sections and evaluation of hidden conditions. 3. New duct fabrication and installation, with seal verification. 4. Insulation on ducts in unconditioned spaces as required. 5. Testing and balancing. We measure static pressure and adjust dampers. 6. System start-up, filter cabinet labeling, and homeowner orientation. Common variables that add time: - Hidden structural conflicts inside chases. - Additional returns or size changes requested during the job. - Unexpected drywall or carpentry needs. ## Permits, Code, and Insulation Requirements in Our Climate Compliance protects safety and energy use. In our region, the International Energy Conservation Code typically requires R-8 insulation for ducts in attics and R-6 for ducts in other unconditioned spaces, with sealed joints. Local enforcement varies by jurisdiction, and we align our work with the authority having jurisdiction. Balanced airflow is a code and comfort concern. Returns and supplies must be sized to keep static pressure within manufacturer limits. We measure this during and after the install to document compliance and performance. ## Ways to Save Without Cutting Corners You can reduce cost and improve results with smart choices. - Prioritize returns and filter cabinet sizing before full replacement. - Keep runs short and straight where possible. - Choose metal trunks with short insulated flex branches for quiet performance. - Schedule during off-peak seasons when possible. - Enroll in a maintenance plan to protect your investment. Our Comfort Club provides two included maintenance visits per year, priority scheduling within 24 hours, 15 percent off repairs, and 10 percent off indoor air quality products. Clean filters and tuned equipment keep static pressure in the safe zone and extend duct life. ## Red Flags and Questions to Ask Any Contractor Avoid costly do-overs with this checklist. Questions to ask: 1. Will you test static pressure before and after the job? 2. How are returns sized, and will you add or enlarge them if needed? 3. What filter cabinet size do you recommend and why? 4. What insulation level will you install in unconditioned spaces? 5. Will you provide a clear, line-item proposal? Red flags: - Bids that skip testing or balancing. - One-size-fits-all filter upgrades without checking cabinet size and blower configuration. - No mention of code-required insulation or sealing. - Vague scope with no material details. ## Real-World Cost Scenarios - Partial rework in an open Sioux Falls basement - Add one return, replace two kinked flex runs, and upsize the filter cabinet. Typical range 1,400 to 2,500 dollars. Usually one day. - Whole-home replacement in a finished two story in Brandon - New trunks and branches, code insulation in attic runs, balancing, and patch-ready access. Typical range 5,500 to 9,000 dollars. Two to four days. - Zoning upgrade for a Tea split-level - Add second zone with dampers and thermostat, rebalance returns. Typical range 1,800 to 3,200 dollars. One to two days. Remember, measured verification is the key. We start with airflow, then design the most cost-effective path to your comfort. > “They checked everything from water and air temps to fan operation. I feel confident the situation was captured correctly.” ## Frequently Asked Questions ### How much does it cost to replace air ducts in a typical home? Most homes land between 2,500 and 7,500 dollars. Small partial reworks can be 1,200 to 3,000 dollars, and complex, tight-access projects can reach 8,000 to 12,000 dollars. ### How long do air ducts last before I should replace them? Well-installed ducts often last 15 to 25 years. Replace sooner if you have chronic comfort issues, visible damage, or static pressure that stays high after fixes. ### Is it better to replace or repair ducts? Start with testing. Many homes only need added returns, a larger filter cabinet, or sealing. Replace when ducts are damaged, contaminated, or poorly sized throughout. ### Do I need a permit for duct replacement? Requirements vary by city and scope. We confirm with the local authority and include any needed permits and inspections in our proposal. ### Will new ducts lower my energy bills? Yes, if they are sealed, insulated where required, and balanced. Leaky or restrictive ducts can waste 20 to 30 percent of conditioned air, so corrections can pay back. The smartest way to manage air duct replacement costs is to measure first, then fix what matters. In many Sioux Falls homes, right-sizing returns and the filter cabinet solves comfort issues without a full replacement. When you do need new ducts, clear line items, code-grade insulation, and verified static pressure deliver the results you expect. Ready for a pressure-tested quote you can trust? Call DRG Mechanical Inc at (605) 202-8996 or schedule at http://drgmechanical.com/. Ask about our Comfort Club for two included maintenance visits per year, 15 percent off repairs, and priority scheduling. We serve Sioux Falls, Brandon, Harrisburg, Tea, Luverne, Rock Valley, Canton, Rock Rapids, Hudson, and Hull. About DRG Mechanical Inc DRG Mechanical helps families feel more comfortable and breathe easier in their homes. We right-size systems using a home comfort analysis and load calculation, verify static pressure and return sizing, and label filter cabinets for simple future service. We are an independent American Standard Customer Care Dealer and the local geothermal experts. Our licensed technicians provide no-pressure options, 24-hour responsiveness for plumbing emergencies, and our Comfort Club includes two complementary maintenance visits per year. Serving Sioux Falls and surrounding towns with honesty, craftsmanship, and proven results.

Duct Services in Greater Sioux Falls

Q: How Can I Seal a Leaking Air Duct to Improve HVAC Efficiency?

Sealing a leaking air duct improves HVAC efficiency by stopping air loss and restoring balanced airflow; use HVAC mastic or UL 181 foil tape rather than cloth duct tape. Most leaks come from loose joints, dried-out old tape, and gaps where ducts meet boots or the air handler. Before sealing, confirm the system can breathe: high static pressure or undersized returns can make leaks seem worse and reduce comfort. At DRG Mechanical, we start with airflow measurements—static pressure, return/supply balance, and filter fit—so fixes don’t create new restrictions, and we often find right-sizing or cabinet adjustments help more than sealant alone. Homeowners we serve near Larchwood benefit from our seal verification and cabinet labeling that keeps future filter changes simple and correct. A common field find: “air leaks” can be a symptom when the real issue is return sizing. Try these focused steps: - Locate leaks with smoke/incense or feel for air while the fan runs. - Clean surfaces; brush on water-based mastic at seams, or use UL 181 foil tape on clean metal. - Seal around supply/return boots and check filter cabinet door fit and gasket. - Recheck airflow; if static stays high, consider return modifications or zoning with a pro. If you smell combustion fumes or see damaged flex duct, stop and call a licensed technician. Updated: 2026-03-30 Need help in Larchwood, IA? Call (605) 202-8996 or book online.

Why us

Why Choose Us

Licensed and insured

Certified technicians who meet every code and standard

No-pressure guidance

Free evaluations with honest recommendations

Local expertise

Locally owned and rooted in the Sioux Falls region

Comfort Club perks

Members get 15% off repairs and priority scheduling

Proven satisfaction

4.9 rating from 91 reviews

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What Our Customers Say

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“Brian Meffert is always so professional and does excellent work!”

5.0
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“Today Nate came to inspect my furnace and also put in a new filter.”

5.0
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“Quick little bit of insulation and job done.”

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Frequently Asked Questions

How much does air duct replacement cost for a typical home?

DRG Mechanical Inc confirms air duct replacement pricing only after an in‑home inspection and airflow testing, because costs vary by home size, duct layout, access, and scope. Most of the cost usually comes from labor to replace or modify runs while restoring balanced supply and return airflow. Our process verifies static pressure, return/supply balance, and filter‑cabinet fit; many homes don’t need full replacement once those issues are corrected. We regularly perform these evaluations in homes around Alvord and nearby towns. A small return upgrade can drop static pressure more than replacing two supply branches. Comfort Club members receive two included maintenance visits per year, which helps keep ducts balanced over time.

Typical price drivers we verify on site:

Total duct length and material required.
Attic, crawlspace, or tight‑chase access that affects labor.
Zone additions or layout changes to solve hot/cold rooms.
Filter‑cabinet upsizing and seal improvements tied to pressure.

Book an assessment to get a firm quote and a clear repair‑versus‑replacement plan.

Updated: 2026-03-23

Need help in Alvord, IA? Call (605) 202-8996 or book online.

How Can I Seal a Leaking Air Duct to Improve HVAC Efficiency?

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MN

Why Choose Us

Licensed and insured

No-pressure guidance

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Comfort Club perks

Proven satisfaction

What Our Customers Say

5.0professionalism

5.0quality

5.0speed

Frequently Asked Questions

Helpful Resources

Sioux Falls HVAC Duct Services to Stop Dripping

Fairview, SD Duct Services: DIY or Pro Cleaning?

Brandon, SD HVAC Duct Services: Replace Ductwork in Walls & Attic

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