Exhaust Fan Installation in an older home

Exhaust Fan

Exhaust fans are important in maintaining a good ventilation inside the home. (Photo Credits)

To ensure appropriate ventilation inside the home, bathrooms and other moist areas should have an exhaust fan. And while most current homes have one that are already installed, some older houses do not.

If a homeowner is thinking of installing an exhaust fan and he is unsure about how to do it, then his safest bet is to call up an HVAC professional to help him do the job.

For those who may want to give it a try, some books, as well as the Internet is a good source of step-by-step instructions to help with this type of home project.

The website This Old House has an extensive tutorial on this. Plumbing Association of San Diego        

“Bath vent fans are rated by how many cubic feet of air they can move in one minute, known as the CFM rating. To determine which size fan to buy for your bath, multiply the room’s square footage by 1.1. For example, a 100-square-foot bath would require a 110 CFM-rated fan. Fan’ also have a sound rating, measured in sones. (A modern refrigerator operates at about one sone.) Vent fans range from as low as 0.5 sone up to about 6.0 sones. You’ll find both the CFM and sone ratings printed on the vent fan’s box.”

Common HVAC Problems in Older Homes

Check out the rest of the material here.

Old House Vent Fan Installation

House Logic also came up with a comprehensive explanation on how to install bathroom exhaust fans. A/C And HVAC   

“Bathroom fan installation isn’t brain surgery — collect air here; exhaust air out there. But it’s not for beginners either, because the project includes removing drywall, perhaps drilling through joists, certainly busting through an exterior wall or roof. We suggest hiring an HVAC pro…”

Read the whole tutorial guide here.

Related Plumbing and HVAC Related Services:

The website Today’s Homeowner meanwhile came up with tips on installing bathroom vents.

“As long as the wiring for your bathroom vent fans is attached to a Ground Fault Circuit Interrupter (GFCI) and the fan is rated for a shower area, the best place to locate your vent fan is on the ceiling in or near the shower where it will do the most good. Vent fans that include a heater, however, should not be installed over a shower.”

What to do when the HVAC Unit leaks

Read the rest of the tips here.


Installing a bathroom fan can greatly help in minimizing mold and mildew problems at home.

 Diamond Ace Contractors

5052 Genesee Ave, San Diego, CA 92117

(888) 231-1086

Diamond Ace Contractors Air Conditioner Servicing