Choosing A Product

commercial building preventing sewer vent or stack  plumbing vent/ plumbing stack from freezing up

Model #PV4-24-1

The 24” long No Frost Venting Vent Kit Model #PV4-24-1 is  designed to fit a 4” diameter plumbing vent stack and requires a minimum of  20 inches of uninterrupted plumbing stack length for proper installation. 

Using a measuring tape, measure the inside of your plumbing  stack from the top of the vent stack down into the building. If there is a minimum of 20 inches of uninterrupted stack length, the 24” long model #PV4-24-1 will be best suited for this application. 

If the height of the plumbing stack above the roof line exceeds 12 inches, the complete portion of your vent stack above the roof deck must be insulated.


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Model #PV3-24-1

The 24” long No Frost Venting Vent Kit Model #PV3-24-1 is designed to fit a 3” diameter plumbing vent stack and requires a minimum of 20 inches of uninterrupted plumbing stack length for proper installation. 

Using a measuring tape, measure the inside of the plumbing stack from the top of the vent stack down into the building. If there is a minimum of 20 inches of uninterrupted stack length, the 24” long model #PV3-24-1 will be best suited for this application. 

If the height of the plumbing stack above the roof line exceeds 12 inches, the complete portion of the vent stack above the roof deck must be insulated.

If there is not an unobstructed 20-inch clearance within the vent stack from the top of the stack into the building, you may require the 16” pipe vet kit model #PV3-16-1. 


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Model #PV3-16-1

Designed specifically for a vent stack that  does not have an unobstructed 20 inches of clearance due to an elbow in the pipe that will not allow the 24” kit to go down far enough into the vent and the  option to raise the kit up and insulate the stack is not practical.

The 16” long No Frost Venting Vent Kit Model #PV3-16-1 is designed to fit a 3” diameter plumbing  vent stack and requires a minimum of 12 inches of uninterrupted plumbing stack length for proper installation. Using a measuring tape, measure the inside of the plumbing stack from the top of the vent stack down into the  building. If there is a minimum of 12 inches uninterrupted stack length, the 16” long model #PV3-16-1 will be best suited for this application. If there is a minimum of 20 inches uninterrupted stack length, the 24” long model #PV3-24-1 will be best suited for this application. 

If the height of your plumbing stack above the roof line exceeds 8 inches, the complete portion of your vent stack above the roof deck must be insulated.


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Model #PV2-24-1

This kit can only be used on a 2” vent pipe or a  3” pipe that is reduced to a 2” pipe just under the roof deck. This kit has to be insulated on any vent piping above the roof deck, and it cannot be more than  12 inches above the roof deck.

The 24” long No Frost Venting Vent Kit Model #PV2-24-1 is designed to fit a 2” diameter plumbing vent stacks and requires a minimum of 20 inches of uninterrupted plumbing stack length for proper installation. 

Using a measuring tape, measure the inside of the plumbing stack from the top of the vent stack down into the building. If there is a minimum of 20 inches  of uninterrupted stack length, the 24” long model #PV2-24-1 will be best suited  for this application. 


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Wind Guard

The No Frost Venting  Wind Guard will fit on all No Frost Venting Vent Kits. If you encounter a long period of cold weather with extreme winds, reverse air flow may occur, creating a downward pressure in the sewer stack. This reverse air flow and  downward pressure in the sewer vent stack over an extended period may cause the plumbing vent stack and vent kit to freeze up. 

The No Frost Venting Wind Guard clamps to the top of the No Frost Venting Vent  Kit. It deflects the wind either under or over top the wind guard, creating a negative pressure in the sewer stack that pulls the sewer gas up the vent pipe and assists in the function of the No Frost Venting Vent Kit.

In the event it is determined a Wind Guard is required, install the curved front of the kit facing north or into the predominate cold wind.


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