What is ULC S636?

ULC-S636, Standard for Type BH Gas Venting Systems, is the applicable Canadian UL standard for gas-burning, condensing appliance venting. Similar to the USA, venting for Category II-IV appliances can be Type BH venting that is listed to ULC-S636. Type BH a is venting designation that is unique to the Canadian market.

Which category appliance requires the use of 636 venting?

System 636 PVC is classified as Type BH Class IIA vent, suitable for use on appliances with flue gas temperatures up to and including 65ºC (149ºF).

Is 636 PVC or CPVC?

CPVC (CHLORINATED POLYVINYL CHLORIDE) System 636 CPVC carries a ULC S636 Class IIB certification and is certified for use up to and including 90°C (194ºF). Ensure the proper System 636 CPVC Cement and Primer is to be used for installation.

What is Category 3 vent pipe?

Category III is defined as a gas heating appliance with a flue loss equal or greater than 17% (non-condensing) with a positive vent static pressure. In a Category III venting system, if there is a leak in the venting system, flue gas will flow from the flue pipe into the space.

What are B vents?

B vent: This approach, also called natural vent, pulls air from indoors for combustion and vents it outside. It features a chimney with a double wall pipe which runs from the fireplace to outside of the home. Homeowners can purchase fire boxes inside another box.

Can you use PVC for furnace exhaust?

Suitable materials for the vent and condensate pipes include PVC (polyvinyl chloride), CPVC (chlorinated polyvinyl chloride), and ABS (acrylonitrile-butadiene-styrene) plastic pipe, depending on the furnace’s specified exhaust gas temperature.

What is the maximum temperature for 636 approved PVC pipe?

System 636 PVC is listed as Type BH Class IIA venting system with a maximum temperature rating of 65ºC (149ºF). System 636 CPVC is listed as Type BH Class IIB venting system with a maximum temperature rating of 90ºC (194ºF).

What is B vent used for?

Do you need primer for 636?

solvent cementing process is beneficial as it allows for deeper penetration of the weld after assembly. In Ontario, primer is mandatory for usage on System 636 for installation temperatures at or below 0ºC, and for installa- tions of 6” and 8” CPVC System 636 in all conditions.

What type of PVC is used for furnace venting?

PVC schedule 40 pipes
Condensing Furnace Codes and Recommendations Despite the confusion, the safe practice would suggest the use of PVC schedule 40 pipes for the air intake vent on the furnace and CPVC for the exhaust flue vent, given its higher service temperature.

Can you use cellular core PVC for furnace exhaust?

The Supplemental Information to the installation instructions for one of the largest manufacturers of cell core PVC piping, Charlotte Pipe, states “Never use PVC or ABS cellular core pipe for combustion gas venting”.

Can ABS be used for furnace exhaust?

PVC or ABS plastic piping is often used on high-efficiency heating and water heating systems as vent piping for the exhaust gases, since the exhaust temperatures are relatively low. This piping is often vented out the side of the home.

Can you use PVC glue on 636?

Admin. According to IPEX, Section 8(c) refers to IPEX 636 ABS, 636 PVC and 636 CPVC. IPEX states the 636 PVC cement (grey) can be used on the non 636 PVC material.

What is Category 3 vent piping?

What is B type venting?

AmeriVent Type B gas vent uses a double wall of metal pipe for insulation and safety. The inner pipe of reflecting aluminum heats quickly, containing the warm flue gases inside. The airspace between the inner and the outer pipes provides insulation against heat loss to keep the warmer flue gases on the rise.

Can you vent a furnace with PVC?

To combat this issue, high efficiency condensing furnace uses PVC pipes to extract the acidic water from your home. These are connected to the furnace and routed out to the side of your home. The venting system is installed at the same time as your high-efficiency furnace.

What is ULC S636 Type BH?

ULC-S636, Standard for Type BH Gas Venting Systems, is the applicable Canadian UL standard for gas-burning, condensing appliance venting. Similar to the USA, venting for Category II-IV appliances can be Type BH venting that is listed to ULC-S636.

Does ulc-s636 meet the ul-1738 standard?

This is not required for ULC-S636. Given the more stringent requirements of the UL-1738 standard and the additional tests required to assure its materials can survive the real world environmental stress, it is apparent that the UL-1738 standard should continue to be the standard strived for by vent manufacturers and required by code officials.

What is ULC S636 certification for flue gas vents?

The use of plastic venting systems on gas fired water heaters, furnaces and boilers has undergone a significant change. CSA B149.1 Natural Gas and Propane Installation Code now requires all special venting material to be certified to ULC S636 across Canada. IPEX addressed this market need with System 636, a fully certified flue gas vent system.

What are UL 1738 and ulc-s636 venting?

This article provides a brief overview of UL 1738 and ULC-S636 venting (and special gas venting) and some of the unique considerations that are needed. When fuel gas is burned, heat is created along with combustion products and byproducts, including water vapor, carbon dioxide, and other gaseous compounds.

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