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air quality


greenxman
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I don't know what topic to put this in.

so has anyone have an air makeup unit in the shop? it brings in fresh air and preheats or cools it with the bad air as it get blown out. (has vent pipes in and out with fans) the two airs don't mix.

or do you use a mist-buster type unit? hanging from the ceiling.

everyone says there is the best of course.

thanks for any input.

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3 hours ago, greenxman said:

I don't know what topic to put this in.

so has anyone have an air makeup unit in the shop? it brings in fresh air and preheats or cools it with the bad air as it get blown out. (has vent pipes in and out with fans) the two airs don't mix.

or do you use a mist-buster type unit? hanging from the ceiling.

everyone says there is the best of course.

thanks for any input.

The terms you are looking for are Air Handler or Air Handling Unit (AHU). You are looking for one with a Heat Exchanger, which uses the 'outgoing' air to heat the 'incoming' air. Most units will be in the 70-90% efficiency range. There are numerous designs.

You need to consider both humidification and dehumidification of the incoming air.

A good unit will have provisions for both, but the whole system design will depend on your location's climate.

Look at:

  • Carrier
  • Johnson / York
  • Lennox
  • Rheem
  • Trane

A good HVAC system should be designed to handle the high and low temperature swings of the winter and summer, and be designed to exchange the entire volume of building air completely at least 4 times per hour. I think an air change rate of 6 times per hour is better for everyone's health. That means you have to move a volume of air equal to the building's volume, every 10 minutes. So take whatever CFM rating the AHU has, and add a zero. (For example, a AHU that is rated at 2,000 CFM, would flow 20,000 CFM in 10 minutes. If your building was 100,000 Cu/Ft., you would need 5 AHU's, or a larger unit that could handle 10,000 CFM.)

You should also consider noise attenuation. Both vibration isolation on the mounting points and sound attenuation from the blower fan to the rest of the ductwork should be considered. 

https://www.carrier.com/commercial/en/us/products/airside/air-handlers/

 

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