jar546
CBO
Is the 200cfm clothes dryer limit before makeup air only for gas dryers?
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Clothes Dryer Makeup Air
- Thread starter jar546
- Start date
jeffc
Bronze Member
We enforce the 2015 IMC Sec. 504.6, Makeup Air, on all dryers.
Do you impose makeup air for an electric kitchen stove?
mtlogcabin
SAWHORSE
The 200 cfm make up air requirement is for gas dryers only
For the electric stove no but maybe for the exhaust hood/microwave installed above it if there are gas appliances in the home depending on the size of the exhaust system
G2407.4 (304.4) Makeup air provisions.
Where exhaust fans, clothes dryers and kitchen ventilation systems interfere with the operation of appliances, makeup air shall be provided.
For the electric stove no but maybe for the exhaust hood/microwave installed above it if there are gas appliances in the home depending on the size of the exhaust system
G2407.4 (304.4) Makeup air provisions.
Where exhaust fans, clothes dryers and kitchen ventilation systems interfere with the operation of appliances, makeup air shall be provided.
jar546
CBO
Over 400cfm
jeffc
Bronze Member
The dryer makeup air is to ensure an adequate volume of air to avoid overheating. The IMC does not state that this only applies to gas appliances.
jar546
CBO
I agree, only for gas dryers but I am continually hearing about some applying that code for electric dryers. The code is in the Fuel Gas section of the IRC and FBC/Residential.
jar546
CBO
So you apply the IMC to one and two-family dwellings?
So a louvered bifold door does the trick if it is a closet?
mtlogcabin
SAWHORSE
Correct
However a typical residential dryer exhaust system with multiple elbows will not exhaust 200 cfm.
From Whirlpool
Dryer Airflow The airflow of a dryer depends on the design of the exhaust vent. Each dryer model has a maximum rated vent length, shown in the product literature that is supplied with each model, or on the Whirlpool.com website. The exhaust airflow of any Whirlpool produced dryer at the maximum rated vent length is at least 105 CFM. The maximum airflow is 230 CFM. This includes standard vent and long vent dryer models.
However a typical residential dryer exhaust system with multiple elbows will not exhaust 200 cfm.
From Whirlpool
Dryer Airflow The airflow of a dryer depends on the design of the exhaust vent. Each dryer model has a maximum rated vent length, shown in the product literature that is supplied with each model, or on the Whirlpool.com website. The exhaust airflow of any Whirlpool produced dryer at the maximum rated vent length is at least 105 CFM. The maximum airflow is 230 CFM. This includes standard vent and long vent dryer models.
Mr. Inspector
SAWHORSE
So how do you know that the dryer exhaust or make-up air complies before they put in the dryer? Most final inspections do not have a dryer installed yet.