If you drive through any neighborhood in Minneapolis or Saint Paul, you’ll find a handful of gas vents with missing or improper vent caps. These improper caps all need to go.

old vent caps

The most serious problem with this style of vent cap is that it can collapse and block the vent.

fallen vent cap

The condition pictured above is an imminent safety hazard that needs immediate repair; this will likely cause the combustion gases from the furnace and water heater to backdraft into the home. Not only that, but this will also cause the combustion appliances to burn improperly, causing high levels of carbon monoxide to enter the home. That’s how people die. Again, this is extremely dangerous.

What to do about old vent caps

The simple fix for this condition is to replace the vent cap with a new, UL listed vent cap. Just stop by any home improvement store and you’ll find them in the HVAC department. If you look for these in the roofing section, you probably won’t find the right one.

listed vent cap

Newer vent caps will be somewhat enclosed at the top, which will help to prevent water and pest intrusion. This design also helps to prevent wind from causing gas appliances to backdraft. Also, these designs won’t allow the cap to collapse and block the vent.

The one that I’m blogging about today was commonly known in the trades as a “coolie cap”.

Coolie hat listing on Amazon

“Coolie” is a dated, offensive term for unskilled Asian workers that shouldn’t be used.  A few PC terms for this cap would be an “unlisted cap”, an “unapproved cap”, or a “witches cap”.

Author: Reuben SaltzmanStructure Tech Home Inspections

Subscribe button

About Reuben Saltzman

Reuben is a second-generation home inspector with a passion for his work. He grew up remodeling homes and learning about carpentry since he was old enough to hold a hammer. Reuben grew up thinking he was going to be a school teacher because he enjoyed teaching others so much. In a sense, that’s a lot of what home inspections are about, so Reuben truly does what he loves. Sharlene has worked with Structure Tech since 2000 and Reuben has been contributing to her blog since 2008.

Related Posts

Combustion Air Ducts, Part II: Problems and Solutions

By far, the most common problem that occurs with combustion air ducts is that they get blocked. When a combustion air duct is blocked, air needs to leak in to the house through many different undesirable pathways.

Read More

Chandeliers Above Bath Tubs

Chandeliers above bath tubs are apparently all the rage today. I think this is a great look, but as a home inspector I’m going to be a wet rag and say these are all improper installations.

Read More

Natural Gas Information You Won’t Hear Anywhere Else

On Sunday, September 21st, a gas explosion demolished a vacant fourplex in north Minneapolis.  This was the second north Minneapolis home to have this happen since March.  I’ll go out on a limb and say I’m sure both explosions were caused by natural gas leaks, which were both the results of copper thieves doing their.

Read More

Leave a Reply

Be the First to Comment!

Notify of
avatar
wpDiscuz