ERV system

[yvette]

Hi, I'm trying to dig through codes to see if ERV systems are actually REQUIRED any where or just allowed. Thanks -

 

[TheCommish]

In Massachusetts stretch code communities they are required

 

[Sifu]

Maybe. I have been trying to understand the tables and am not quite there yet. 2018 IECC 403.7.4 seems to be the section that mandates them, with the thresholds listed in tC403.7.4(1) & (2).

 

[classicT]

Hi, I'm trying to dig through codes to see if ERV systems are actually REQUIRED any where or just allowed. Thanks -

Depends on the occupancy classification and the adopted code, including State ammendments.

In the 2018 Oregon Residential Code, a HRV is required where taking Table N1101.1(2) Additional Measure #8 - minimum sensible heat recovery efficiency of not less than 66 percent.

For commercial, see the 2019 Oregon Commercial Energy Code, Section 6.5.6 - Energy Recovery. Requirements are dependent upon occupancy/use.

 

[Sifu]

In Massachusetts stretch code communities they are required

Just curious, what is a stretch code community?

 

[classicT]

Just curious, what is a stretch code community?

Stretch codes are when a local AHJ adopts a code beyond the typical state code. Several states have created their own base energy code, and then a stronger version that they leave up to the local AHJ to adopt. Some states/localities use standards such BuiltGreen or LEED in-place of a model energy code.

They are also sometimes called Reach Codes.

 

[Sifu]

Thanks. I might call them over-reach codes, but now I get the stretch part.

 

[classicT]

And since the OP is from OR, here is a link to the Oregon Reach Code webpage.

 

[TheCommish]

Mass has an opt in stretch code by community vote., which is above the base code, (currently HERS score of 52) requires community to enforce a stricter stand for entry compliance, for doing that you get to compete for grant monies to do energy improvements to municipal infrastructure

program linked here https://www.mass.gov/info-details/stretch-energy-code-development-2022

 

[steveray]

for doing that you get to compete for grant monies to do energy improvements to municipal infrastructure

And since when could government not go for "free" money?......No matter what it costs the taxpayers....

 

[TheCommish]

There are 351 communities in Mass. 50 have not opted into the stretch code, the pot of state money is getting smaller by the year