To get email notification when someone adds to a thread you're following, click on the star in the thread's header and it will turn yellow; click again to turn it off. To edit your profile, click on the gear.
The Wall has a powerful search engine that will go all the way back to 2002. Use "quotation marks" around multiple-word searches. RIGHT-CLICK on the results and choose Open Link In New Window so you'll be able to get back to your results. Happy searching!
In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
Need to contact us? Visit

determining amount of CFM needed

i realize that i need to pull additional air into my boiler room for several boilers that i have in it ,through the flexible 5 inch duct that is in place. my question is how do i determine how much air and how strong the fan must be ( is there a formula and is it based purely on BTU or does thenumber of boilers also play a role ) ? also can someone recommend an online resource for purchasing such a fan. thankyou for your assistance
This discussion has been closed.


It looks like you're new here. If you want to get involved, click one of these buttons!