Dehumidifier capacity selection.

It is always a big challenge for users like us to select capacity of dehumidifier for our home. Once we decided to go for new dehumidifier unit then we always faced with common question of which capacity. In this article we will try to understand how to decide capacity and airflow of portable dehumidifier for home.

What home dehumidifiers should have?

dehumidifier home humidity-1While selecting dehumidifier for home we need to make sure that capacity should be sufficient so that it an remove humidity at the same time dehumidifier should be able move over certain amount of air in certain period of time. In simple word we need to decide liter/day extraction capacity of and Air flow volume of dehumidifier. Extraction capacity generally mentioned in terms of liter/day or pints/day. It is nothing but maximum amount of water that dehumidifier can extract from air in one day. Air flow volume is important to consider since moisture from air will get extracted only if air passes through dehumidifier. More the Air flow, more air will pass through dehumidifier and moisture level from air will come down quickly. Air flow volume mentioned in terms of Cubic Feet per Minutes (CFM).

Selecting Liter/day Dehumidifier Size.

As long as dehumidifier for home is concerned, Association of Home Appliance Manufacturers (AHAM) has made job very easy.  AHAM offered easiest dehumidifier buying guide. AHAM has recommended capacity of dehumidifier depending on size of room and humidity level in room. Capacity of dehumidifier is directly proportional to humidity level in room and size of room. is Depending on level of humidity and its symptoms AHAM divided area in following four types:

1) Extremely Wet Area: Areas with extremely high humidity level with Wet Floors and High-Load Conditions.

2) Very Wet Area: Areas with high humidity which tends to condensation water drops formation on walls and seepage on walls.

3) Very Damp Area: Common symptoms of these areas are bad odour from carpet, clothing, sofa and damp spot of walls.

4) Moderately Damp Area: In such areas you feel uncomfortable and with smell.

 

Depending on Humidity levels (as mentioned above) and size of room, AHAM offered following guideline to select size of dehumidifier.

dehumidifier sizing guideline by AHAM.

 Selecting Air flow volume for dehumidifiers.

CFM Air flow volume needed in room is decided with help of square foot area of room and humidity level in room. Air flow volume is directly proportional to square feet area of room and humidity level in room. Square feet area of room determines how much air should pass through dehumidifier while humidity level in room determines how many times this air should pass through unit in hour. This term is denoted as ACH or air changing per hour.

Air flow volume in CFM can obtain by multiplying square foot area of room and recommended ACH for that room. Recommended ACH from different areas as follow:

1) For Extremely wet area: These are areas where humidity level in range of 90% to 100% RH. Recommended ACH is 6.

2) For Very wet area: These are areas where humidity level in range of 80% to 90% RH. Recommended ACH is 5.

3) For Very Damp area: These are areas where humidity level in range of 70% to 80% RH. Recommended ACH is 4.

4) For Damp area: These are areas where humidity level in range of 60% to 70% RH. Recommended ACH is 3.

By multiplying Area of room in square feet to Recommended ACH, one can get Air flow Volume for Dehumidifier.

 

For any further query please contact us. We hope this article will help to select proper dehumidifier size.

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