08/21/2026
Here is a recent duct and termination vent install we did for a customer. I initially was called for a basic cleaning and inspection. When I could not locate a termination vent I decided to inspect the customer’s crawl space where I found flex hose ran straight through a hole in the floor blowing directly into the crawl space. I informed the customer that there were many code violations so we immediately came up with a plan of action. We had two options, run new duct work to the roof or run it through the crawl space and drill a hole for the termination vent in the brick wall. She decided she wanted it through the crawl space and wanted the hole in the floor moved closer to the wall.
As you can see here in these photos I ran 4” rigid duct work, drilled a 4 1/4” hole in the brick wall with a coring bit, installed a code-compliant termination vent with a magnetic damper to keep it closed and keep critters out, I sealed the old hole with a piece of sheet metal, cut a new hole closer to the wall, and installed a magnetic dryer hook-up to make it more user friendly and easier to hook up and un-hook the dryer for maintenance. After everything was said and done we had satisfied customer with a new, code-compliant dryer vent and a sense of security knowing her home is safe from an inevitable dryer-caused house fire.
I’ve noticed a majority of my customers around here have flex hose ran through the floor or wall, through the crawl space, and out the wall which is no longer code-compliant. Here are just a few consequences of having a dryer vent that is not code-compliant:
1. Increased fire risk. Improper duct material, excessive restriction, lint-catching screws, screens over the termination, crushed ductwork, or poor installation can promote lint accumulation and overheating. NFPA research found that failure to clean was involved in 32% of home dryer fires, and dust/fiber/lint was the item first ignited in 27%.
2. Longer drying times and higher utility costs. Restricted airflow means the dryer has to run longer to remove moisture. Clothes remaining damp after a normal cycle or taking unusually long to dry can indicate a restricted exhaust system.
3. Premature dryer failure. Poor airflow forces the dryer to operate under hotter, more demanding conditions. That can contribute to unnecessary wear on components and shorten appliance life.
4.Moisture problems. A dryer exhaust is required to convey moisture outside the building. Venting into a crawlspace, attic, garage, or other interior area can dump a substantial amount of warm, humid air into the structure.
5. Lint contamination. If a duct terminates in a crawlspace or attic, lint can accumulate throughout that space. Besides creating a mess, you’re depositing combustible material where it doesn’t belong.
6.Problems during a home inspection or sale. A home inspector may identify an improperly installed dryer exhaust as a defect or safety concern. That can result in the seller being asked to correct the system before closing.
7. Possible permitting/code-inspection problems. When work is inspected, a noncompliant installation can require correction before approval. The exact enforcement consequences depend on the local authority having jurisdiction.
