Dose anyone have experience testing high velocity duct systems?I've been asked to duct test a Zhender HRV with comfoducts (2" homerun ducts).I designed & installed a hydronic high velocity system…Continue
"Historically we have done an air barrier on the inside, lot's of intersections, penitrations, discontinuities, easier to damage, etc. Many of us decided that it would be easier to do the air barrier on the outside.
Many still talk about air…"
"While code may not require adding ventilation to an existing kitchen, I would never air seal & insulate a house without adding it (or at least recommending it). If you remodel a kitchen it should be required.
As for the AAV's they would be…"
"1) not important; air leakage can introduce pollutants to the building (dust, moisture, gases, etc.). Moisture can damage a building when it condenses on surfaces, and you get mold, or rots. High indoor RH (relative humidity) can increase off…"
"Equipment is rated for it's configuration (ducted or ductless). So you can compare equipment efficiencies directly. However, a ductless system has no distribution losses. A ducted system would have losses if the ducts are in unconditioned…"
"AAV's are recognized in the state plumbing code, although they are in the IRC (international residential code, not sure about the UPC, universal plumbing code). Not sure if any city's in CA allow them outright. I know of a PH project in…"
"CA modifies the National / International codes, and does not allow some things, but does others.
Each City / County has to adapt the CA code, but not always everything. City / Counties can adopt stricter standards.
Code often lags behind what we…"
"The owners (like Alice) have had varying degrees of involvement, mainly on the planning (research) side. I don't have any direct involvement or knowledge of local projects (that would be good examples) that were heavy sweat equity. Most of the…"
"The is a project in Larkspur CA that did an exterior retrofit. They air sealed the existing plywood siding, added continuous rigid rockwool insulation, furring strips (rain screen) and new siding. The roof was stripped, new osb for air sealing…"
"Plan, plan, plan, plan. The 1st step to is to understand the house, how it's built, the systems, the condition, etc. You need to look at what you want to do, and what needs to be done. You can than come up with options, do some cost estimating,…"
Join a lively panel discussion on high performance windows. We'll cover some basics, as well as diving into in-depth technical details. Some of the topics we'll explore include frame performance (e.g. whats the impact of a warm edge spacer?), glazing performance (e.g. balancing solar gains and u-value), certifications (e.g. what the process and testing for PH certifications) as well as practical questions around installation concerns, lead times, etc. Bring your burning questions as the…See More
"Adding electric resistance coils in the ducts would likely have caused the problem discussed in the post;
How Do We Make Energy Efficiency Sexy, or at Least Interesting?
With your customer ending up with a higher electric bill.
Adding Solar often…"
"A cracked heat exhanger would not cause high CO (unless it affected the operation of the flame).
A cracked heat exhanger might allow the CO into the house, did you check ambient & a supply register for CO?
High CO can mean a burner needs…"
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