Home>Discussions>INSULATION & HVAC>Why is there an outside vent next to my boiler
2 posts / 0 new
Last post
Why is there an outside vent next to my boiler


I recently bought a older house (1928) house with steam heat.  The boiler is in the basement.  Next to the boiler is an insulated duct shown in the attached picture.  At the top of the duct is an open vent to the outside.  The bottom of the duct is open.

The tempurature in Michigan is in the teens right now and cold air is flowing it the basement make it (and the house) very cold.

What is the purpose of this vent?  Is it OK to cover it?

Re: Why is there an outside vent next to my boiler

That is most likely for fresh air for the boiler to burn the fuel, due to the fact that the area may not have enough fresh air. I am only guessing. Maybe have a HVAC contractor come out and give the boiler an inspection, and ask them if the duct may be removed. It may have fed fresh air into the old system that has been replaces, and no one removed it. I would not cover it  remove it without talking with an expert in your area, and a certified boiler contractor.


Handy Andy In Mt Airy NC

Sponsored Stories

TV Listings

Find TV listings for This Old House and Ask This Old House in your area.