Changes of air in Boiler gas duct

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0	How many air changes per hour required for Boiler gas duct? gas_duct boiler air asked 16 Dec '18, 22:03 Dec. 16, 2018, 10:03 p.m. KnowledgeBase 81●285●338●480 accept rate: 0%

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cheng · Answer 1 · Dec. 16, 2018, 10:04 p.m.

0	It must be 30 changes per hour permanent link answered 16 Dec '18, 22:04 Dec. 16, 2018, 10:04 p.m. cheng 56●2●5●11 accept rate: 0%