A follow-up study was done on 18 homes to determine whether exhaust-only ventilation
that met ANSI/ ASHRAE Standard 62.
The same issue, however, exists for exhaust-only ventilation
Filtration cannot be sensibly added to an exhaust-only ventilation
system unless one considers the building envelope as part of the filtration system.
For $150 you can meet ASHRAE-62 air change recommendations by using a product like Panasonic's fan for exhaust-only ventilation
," says Pettit.
If you build to code, you will get consistently below 3 ach at 50 Pa; and if you install an exhaust-only ventilation system at the rates you are required to ventilate at, you will pull stuff out of the attached garage and into the house.
dagger][dagger]) It is possible to make the garage more negative than the house even if it has an exhaust-only ventilation system.
For example, Hendron (2007) found that when interior doors were closed, an exhaust-only ventilation
system provides less uniform distribution of ventilation air than a ventilation system that incorporates the central air handler to periodically mix the spaces.
If you actually install an exhaust-only ventilation system operating at Standard 62.
But what is also true is that both Standard 62s effectively eliminate the use of exhaust-only ventilation because it no longer can be made to work in apartments and condominiums constructed to the required tightness standards.