"This is what we do: The Standards are clear: No air sealing, dense packing more than 15% of the shell area, duct sealing outside the thermal envelope, if you cannot complete the or combustion testing protocol. So, if we cannot test…"
"If the tankless water heater is not sealed combustion, then it could be either power vented (one PVC pipe), induced draft (inducer motor and metal pipe), or natural draft (with draft hood). I am not comfortable drilling a PVC pipe to measure…"
"I'd agree w/ the previous post. When going for a worst case test, you only need to measure presssure difference in the CAZ WRT outside. I'm figuring you can get into the CAZ. If required, Measuring exhaust gas for CO and efficiency on a…"
You should be able to access the room where the water heater itself is located. Otherwise if it is in some kind of sealed off space, then it probably doesn't meet code requirements. So you should be able to do a worst case…"
I got this email from a QA program manager. Looking for feedback. Thanks I have a question for you I'm hoping you can shed some light on.How are we supposed to proceed with getting combustion and worst case depressurization numbers from an area that is inaccessible?I just ran into this situation over at customer's home with a tankless water heater on his second floor.The only option to get a flue gas sample is to set up an extension ladder in an alley which doesn't have clearances that are…See More
HVAC design, Manuals J, S, T, & D, Duct leakage, Air flow, ENERGY STAR new home requirements, and more. Since heating & cooling are such a big part of home energy use, understanding HVAC is critical.See More