main air vent

STEAM DOCTOR

good afternoon. i have a 20' 2" main and a 1 1/2" main that is about 15' to the end plus another 15' as a dry return . which air vent should i be using. on the smaller main i only have access to the end of the dry return. thanks.

Steamhead

I'd use

a Gorton #1 or Hoffman #75.



What vent do you have on the other main?

STEAM DOCTOR

no vent

Thanks. i don't think there is a vent on the 1 1/2" main (basement is finished so hard to tell). the plan is to add a tee at the end of the dry return (the end of the main is not accessible). on the 2" main there is a Hoffman 45 which according to Hoffman's web site is not a main vent.

Steamhead

You're right, it's not

and you can vent that main with the same model vent. 

STEAM DOCTOR

thanks

which is better the gorton 1 or the hoffman 75

Steamhead

They're about the same

but the 75 is typically more expensive. Also it's taller, which may be a factor if your height is limited. 

STEAM DOCTOR

gorton #2

would the gorton#2 be beneficial or would it be overkill. thanksY

Steamhead

On such a short main

it would be more than needed. 

STEAM DOCTOR

thanks

thanks for the info