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ventilation

  1. H

    R806.2 exceptions, balance high/low vents, ambiguous language

    1:150 rule does not require a 50:50 balance upper vs lower. 1:300 requires approx 50:50 balance. So a 3000sf attic requires 10sf of venting IF 5 to 6sf are lower, and 4 to 5sf are upper (min 40% max 50% in upper third). So 8sf upper and 2sf lower breaks this rule. That much is clear. Also 2sf...
  2. A

    Makeup air requirements for chemistry lab?

    I'm needing to get a selection for a new makeup air unit for an existing chemistry lab which has fume hoods. I was told by a coworker that chemistry rooms need to be negatively pressurized which would mean the makeup air supply cfm would need to be less than the exhaust cfm, however I don't know...
    • asarkisov
    • Thread
    • ashrae 62.1 chemistry lab fume hood makeup air ventilation
    • Replies: 1
    • Forum: Mechanical Codes
  3. cedenton

    RangeHood Requirements - Panhandle FL

    Hello! I have a rental property in Pensacola, FL. The range needs replaced. It is an electric downdraft range in an island, with no range hood. Replacing this type of stove will be as much as $3000. In review of the Florida Building code online it says: . Exception: Where installed in...
  4. D

    Vape Lounge - Mech Options

    My client is looking to lease a shops space in his shopping center to a tenant who will operate a "vape lounge" in a mechanically separated, 800sf room in the back of the tenant space. The space is currently a grey shell, so all mechanical will be new and fully permitted with the City. My...
  5. N

    Ventilation System For Lube Pit

    I am a project manager for a real estate development firm. One of our clients is an automotive repair facility that also performs oil changes. All locations have a lube pit (basement) under the bays where oil changes are completed. Currently our architect and engineers are designing each of the...
  6. Jordan Fish

    Fire Station Apparatus Bay Ventilation

    Hello Everyone - first time poster here. I am a mechanical engineer from Baton Rouge, LA (Geaux Tigers!). I have recently been reviewing the ventilation requirements for a fire station's apparatus bay. The bay is to be used for storing the vehicles only, i.e. no repair, fueling, etc. I have...
  7. T

    Attic Ventilation exception

    Hi there, I wanted to see if I can get your take on the 1/300 nfva exception for attics. When it comes to calculating vents for small attic spaces I am getting hung up specifying a vent that fits within the upper vents 40-50% limit. For example: Attic over a porch is 123 s.f. At 1/300 the...
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