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Community and Q&A

Air sealing office shed and air exchange

mikeysp | Posted in General Questions on

Hi. My son and I are building a low budget 10 x 12 office shed for him. It is going to be a tight assembly with the details we are using. What is a practical way to make sure he has fresh air exchange? Bath fan on cycle timer? Other? Remember…. very low budget 🙂

Thank you.  


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  1. mikeysp | | #1

    I came up with an idea for air exchange for his office. Since his square footage is 120 ft sq (10x12 building). Using the 2003 ASHRAE 62.2 of 7.5 cfm per person plus 1 cfm per 100 square feet. Typically there will be 1 or 2 people and occasionally 3-4. I thought a 20CFM fan would suffice. 2 x 7.5+1 = 16 CFM. The idea on how to is in my drawing below.

    Thank you for your critique, advice.


  2. Expert Member
    BILL WICHERS | | #2

    For a simple structure like this, a pair of vents on opposite ends of the room, one high, the other low, would probably provide enough ventilation. Put dampers in them and adjust to your preference. You don’t really need a fancy active system. Passive vents are cheap, easy, and reliable here.


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