Boiler Stack Breeching and Venting
Boiler breeching is dependent on boiler type and building configuration. It is very important to fully understand the venting process and the type of combustion by-products that are being directed outdoors. GP Energy Products will get to know your particular system, discuss all possible solutions, and work with your team to provide the best products, sizing and installation to assure your system safe and in compliance.
FREQUENTLY ASKED QUESTIONS
Can I vent condensing boilers with PVC?
- No. PVC is not an approved venting material for an exhaust vent.
What is the difference between a Category I, II, III, IV boiler?
- Category I —atmospheric fired gas boiler with a draft hood or a label for venting with a type B-Vent. These boilers are typically used in buildings designed around a 130°F average water temperature.
- Category II — atmospheric fired condensing boiler. These boilers are typically used in buildings designed around a 130°F average water temperature.
- Category III —forced draft non-condensing boiler. These boilers are used in steam systems and hot water heating applications over 130°F average water temperature.
- Category IV — forced draft condensing boiler. These boilers are used in steam systems and hot water heating applications over 130°F average water temperature.
What products are used for Category I, II, III, IV venting?
- Category I — Type B-Vent maximum temp 550°F. HeatFab is our primary partner for Type B vents.
- Category II — Special Gas Vent meeting UL 1738. Selkirk is our primary partner for gas vent technology.
- Category III —Pressure stack material must meet maximum flue gas temperatures. Typical temperature ranges from a low of 370°F to a high if 1200°F for wood and coal.
- Category IV —Special Gas Vent that meets UL 1738
Can I use polypropylene venting in condensing boilers?
- Polypropylene exhaust stack venting should not be used on any commercial process. A Type B vent is recommended at a minimum.