ATMOX Crawl Space Fans

The ATMOX goal on fan placement is to create a total ventilation solution for the crawlspace. It is very important to have an equal air exchange in the entire crawlspace. Leaving one area without proper airflow can still create undesirable consequences to the crawlspace in that area.  


All ATMOX fans are assembled in the USA. The fans are designed to be quiet so that you will not be able to hear them in your home. (This is a real differentiator from other fans on the market.)

Standard Outlet AC-Powered Fans
  • The ATMOX AC-Powered Fans plug into a standard electrical outlet.  They will run continuously once plugged in unless setup on a control or trigger mechanism.
  • The ATMOX Fans can be used in any combination and configuration.  Each style of fan is best used in a different application. 
  • The ATMOX exhaust and intake fans are designed to fit in a standard 16x8 inch vent opening.  
  • To be used with the ATMOX Controls, a switch relay can be used or an alternate version of the ATMOX control set can be used.  Contact ATMOX for more information on this configuration or setup.
CFM Calculation Tool

This simple tool helps calculate how many fans your crawlspace will need.  The calculation is set up for achieving 4 air exchanges per hour.  ATMOX recommends 4-6 air exchanges per hour.


Cubic Feet of Crawlspace

(Square footage times average height) 

   Multiply above number by 0.07
 Total CFM of Exhaust Fans Needed
  Divide number by CFM of fan selected to determine number of exhaust fans needed 
 Total Quantity of Exhaust Fans Needed:
  •  If Exhaust Fan Quantity is 1-2, then Intake Fan Quantity should be equal to Exhaust Fan Quantity
  • If Exhaust Fan Quantity is 3+, then Intake Fan Quantity should be no less than Exhaust Fan Quantity minus 1
 Total Quantity of Intake Fans Needed:
   Quantity of Dead Space Fans needed will be determined by layout of crawlspace.  Look for any areas that would not geta  cross circulation of air.
 Total Dead Space Fans:


Fan Models

ATMOX Manufactured:


 01-310-001  Double Fan, Exhaust 220 CFM with Vent Cover
 01-320-001  Double Fan, Intake 220 CFM with Vent Cover


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