No actually they (AHAM) specifically does NOT, regarding aluminum flex hose, foil or anything other than SHEET METAL, rigid or semi-rigid duct for any clothes dryer. In fact most member manufacturers specifically designate the use of HEAVY sheet metal duct exclusively for non-condensing gas clothes dryers.
Originally Posted by ****hiller
With stated permissions on the document for republication for public outreach, and with credit to AHAM, the Association of Home Appliance Manufacturers found at www.aham.org:
CLOTHES DRYER FACT SHEET
The installation and maintenance of clothes dryers are an important part of ensuring that the appliance performs as designed. The Association of Home Appliance Manufacturers (AHAM) has reviewed many of the building codes used across the U.S. to ensure that the installation of clothes dryers is in accordance with the manufacturer’s instructions.
AHAM, on behalf of its home laundry manufacturers, submitted comments to the 1999 edition of the National Fuel Gas Code (ANSI Z223.1/NFPA 54) to specify that exhaust and transition vents shall not be constructed of coiled-wire foil or plastic material and that vents be installed in accordance with the clothes dryer manufacturer’s installation instructions. AHAM recommends that clothes dryer vents be constructed of rigid sheet metal or corrugated semi-rigid sheet metal material.
The National Fuel Gas Code offers criteria for the installation and operation of gas piping and gas equipment on consumers' premises. It is intended to promote public safety by providing requirements for the safe and satisfactory utilization of gas.
In addition to submitting comments to the National Fuel Gas Code, AHAM suggests the following tips for the proper use and installation of residential clothes dryers. Consumers should always consult the manufacturer's instructions for guidelines specific to their clothes dryer.
Dryer Care and Maintenance
- Installation. The dryer venting materials are an important factor in dryer performance and safety. AHAM recommends the use of rigid sheet metal or corrugated semi-rigid sheet metal venting material. Do not use coiled-wire foil or plastic venting material. Not using the recommended venting materials could reduce airflow and drying time could be lengthened unnecessarily.
- Maintenance. Dryers need maintenance like any other appliance. In order to keep sufficient airflow around the heating source, lint must be removed from the dryer and vent. Lint and dust can build-up over time and reduce airflow, resulting in decreased performance, by not allowing air to circulate freely through the dryer. Don't forget to clean the back of the dryer, where lint can be trapped. Clean the lint filter before and after each load. The interior of the appliance and venting system should be cleaned periodically by qualified service personnel. If you notice that the drying time is longer, clean the vent system thoroughly to ensure that there is proper airflow. Keep the area around the dryer clean and free of clutter.
- Follow manufacturer’s instructions on installing the dryer and vent system.
- Replace coiled-wire foil or plastic venting with rigid sheet metal or corrugated semi-rigid sheet metal venting.
- Clean the lint filter before and after each cycle.
- Inspect venting system behind dryer to ensure it is not damaged or crushed.
- Do not dry the following items in the dryer:
- Anything containing foam, rubber or plastic (i.e. bathroom rugs, non-slip mats).
For more information, please call Jill Notini at 202-872-5955 ext. 318 or email firstname.lastname@example.org.
- Any item which the dryer manufacturer's instructions specifically state "dry away from heat."
- Glass fiber materials (unless manufacturer's instructions permit).
- Materials on which there was anything flammable (e.g., alcohol, cooking oils, gasoline, spot removers, dry-cleaning solvents, etc.). These should be dried outdoors or in a well-ventilated room, away from heat even if they have gone through the wash cycle. Flammable substances give off vapors that could ignite or explode.
- Fabric soiled with cooking oils.
This Dryer Fact Sheet may be reproduced in its entirety for community newsletters or public outreach. We request that you credit AHAM- the Association of Home Appliance Manufacturers found at www.aham.org.
Gas clothes dryers come complete with Installation and User Guides, which will include information for clearance from combustible materials, maximum length of exaust, number of bends, a minimum airflow requirement (at least) at maximum vent length (Linear Feet minus X per elbow or bend, minus X per other fitting, change of direction, or transition) and a minimum capacity for air flow at minimum vent length (CFM), a minimum duct air velocity uring normal operating conditions (in X FPM) to keep lint moving in the airstream), and back pressure limitations (usually range is between -1.0" (-25mm) water column to 0.6" (15mm) water column when measured at the connection of the dryer to the vent (you need a manometer to measure this), if it is a long vent or standard vent restriction, requirements for room venting, and specific ranges for In the event that you have lost yours, contact the manufacturer with the model and serial number of your dryer and ask how to acquire a reprint. The listed User Guide will include limitations and restrictions for proper materials, venting length, etc. for your GAS CLOTHES DRYER. In the absence of local code or restrictions, they will often reference the National Fuel Gas Code, the International Guel Gas Code, a model Mechanical Code, UL ANSI Standards and/or CSA ANSI Standards for either the Type 1 or Type 2 Gas Clothes Dryers.
Common instructions from a Manufacturer's Included User's Guide, Instructions, Installation for Gas Clothes Dryer, non-condensing type::
Use a heavy metal vent.
Do not use a plastic vent.
Do not use a metal foil vent.
Failure to follow these instructions can result in death or a fire.
WARNING: To reduce the risk of fire, this dryer MUST BE EXHAUSTED OUTDOORS.
Improper venting can cause moisture and lint to collect indoors, which may result in: Moisture damage to woodwork furniture, wallpaper, carpets, etc. Housecleaning problems and health problems.
Local codes and ordinances that exist must also be met. Consult your local building inspector for more information."