ITTOG
Well-known member
The short time frame response must be only for questions that help improve their sales volumes.
Heat Recovery Ventilators
- Thread starter Trail Talk
- Start date
Joe917
Explorer
A big red flag for me is no efficiency rating.
These look interesting, installed in pairs they alternately intake and exhaust. Storing the heat in an internal ceramic block. 90% heat recovery. 230 v required but you may find a similar system with a better voltage requirement:
www.el-vent.com
These look interesting, installed in pairs they alternately intake and exhaust. Storing the heat in an internal ceramic block. 90% heat recovery. 230 v required but you may find a similar system with a better voltage requirement:
Mini HRV - mini heat recovery ventilators | el-vent.com™
Mini HRV systems with two speed ball bearing motors. 92.5% efficiency, power consumption 1.5-2 W. EU delivery within 14, worldwide 21 days. www.el-vent.com™
www.el-vent.com
Here is another product, only available to order in Germany:
The site is in German but your browser can translate to English.
Der original BAYERNLÜFTER - Dezentrales Lüftungsgerät mit Wärmerückgewinnung
Der BAYERNLÜFTER ist ein dezentrales Lüftungsgerät mit Wärmerückgewinnung. Er spart Energie und hilft gegen Schimmel.
www.bayernluft.de
The site is in German but your browser can translate to English.
Trail Talk
Well-known member
I’m talking with them now
Shippn might be an option for mailing outside of Germany. Never tried the service.
Trail Talk
Well-known member
Thanks for the tip on Shippn, I've ordered using them.
Trail Talk
Well-known member
Just arrived, I'm impressed so far. Now to work with Google Translate.
Trail Talk
Well-known member
More than a month later, I have received a reply from Accurasee on their HRV. It makes for interesting reading, kinda reminds me of those ads in the back of Popular Science magazines.
So where to start? I must congratulate J. Smith on his academic advancement. He/she was only a "Sales Lead" when I first talked to the company, referring my "complex technical questions" to others.
And still, they don't have photos of the product they are selling! Apparently its in the hands of their "media team" to decide and Smith couldn't just walk down the hall and snap a cellphone piccy for me.
From the FB photos, however, I can interpret this latest response ;-) To the PhD, a piece of foil dryer vent hose is "a specially engineered piece of a very long tube (as long as a room or more) which is compressed into a small length...The tube is extremely thin at less than .001 inch (4 times thinner than HVAC ducts) and lighter than commercial tubes by a factor of 3-5." Not wrong
HVI or Home Ventilating Institute does have a certification category for Heat Recovery Ventilators and they currently have 159 listed as "HVI-Certified". That title means the performance stats listed by the manufacture have been verified by an independent laboratory and whether those numbers are good or bad is up to the consumer to figure out. Of course, that is how all these pay-for-certification systems work and I'm sure the manufacturer's are well aware that most people won't dig into the HVI database to actually compare one unit to another.
Anyhoo...I've already moved on but I'm embarrassed by this Canadian company and can only stress that anyone considering Accurasee's products do their homework.
So where to start? I must congratulate J. Smith on his academic advancement. He/she was only a "Sales Lead" when I first talked to the company, referring my "complex technical questions" to others.
And still, they don't have photos of the product they are selling! Apparently its in the hands of their "media team" to decide and Smith couldn't just walk down the hall and snap a cellphone piccy for me.
From the FB photos, however, I can interpret this latest response ;-) To the PhD, a piece of foil dryer vent hose is "a specially engineered piece of a very long tube (as long as a room or more) which is compressed into a small length...The tube is extremely thin at less than .001 inch (4 times thinner than HVAC ducts) and lighter than commercial tubes by a factor of 3-5." Not wrong
HVI or Home Ventilating Institute does have a certification category for Heat Recovery Ventilators and they currently have 159 listed as "HVI-Certified". That title means the performance stats listed by the manufacture have been verified by an independent laboratory and whether those numbers are good or bad is up to the consumer to figure out. Of course, that is how all these pay-for-certification systems work and I'm sure the manufacturer's are well aware that most people won't dig into the HVI database to actually compare one unit to another.
Anyhoo...I've already moved on but I'm embarrassed by this Canadian company and can only stress that anyone considering Accurasee's products do their homework.
Last edited:
More than a month later, I have received a reply from Accurasee on their HRV. It makes for interesting reading, kinda reminds me of those ads in the back of Popular Science magazines.
View attachment 909127
So where to start? I must congratulate J. Smith on his academic advancement. He/she was only a "Sales Lead" when I first talked to the company, referring my "complex technical questions" to others.
And still, they don't have photos of the product they are selling! Apparently its in the hands of their "media team" to decide and Smith couldn't just walk down the hall and snap a cellphone piccy for me.
From the FB photos, however, I can interpret this latest response ;-) To the PhD, a piece of foil dryer vent hose is "a specially engineered piece of a very long tube (as long as a room or more) which is compressed into a small length...The tube is extremely thin at less than .001 inch (4 times thinner than HVAC ducts) and lighter than commercial tubes by a factor of 3-5." Not wrong
HVI or Home Ventilating Institute does have a certification category for Heat Recovery Ventilators and they currently have 159 listed as "HVI-Certified". That title means the performance stats listed by the manufacture have been verified by an independent laboratory and whether those numbers are good or bad is up to the consumer to figure out. Of course, that is how all these pay-for-certification systems work and I'm sure the manufacturer's are well aware that most people won't dig into the HVI database to actually compare one unit to another.
Anyhoo...I've already moved on but I'm embarrassed by this Canadian company and can only stress that anyone considering Accurasee's products do their homework.
Hey, new to the forum, but I have read and followed some of the helpful discussion on HRVs for DIY mobile / offgrid projects for a while.
I’m an HVAC engineer with 2 decades of experience in specifying residential and commercial ventilation products. Caveat: I do not work for HVI. I do not specify single room ventilation products (their flows are way too small for my projects).
I do get the point that several pay-for-certification schemes are out there but the Home Ventilating Institute (HVI) is unique. The HVI program actually protects consumers by ensuring that manufacturers advertise products with claims that are tested in third party labs. HVI not only ensures that products are tested by independent labs but actively polices the program. Yearly, HVI purchases multiple units of a product model (or family) from different suppliers and test them to see that they meet performance specs. If a product fails or is falsely advertised, the manufacturer is forced to pull all units from the market and work to take corrective actions. Asides from the yearly tests, a competitor or member of the public can petition the program to do challenge testing to assess the claims of a manufacturer. The losing party pays for the test fees.
Also, the statement that “whether those numbers are good or bad is up to the consumer to figure out” is completely false and misleads the public. HVI certified products make up over 90% of all residential ventilation products for new construction projects in North America. The interesting thing is that HVI products are mostly specified by professionals: designers / architects (low rise) and engineers like me (low and high rise buildings, in my jurisdiction). The professionals that use the “numbers” actually perform detailed engineering calculations and compare all certified units to pick the most suitable ones for their projects. Those numbers are based on specific interpretations of codes and standards (using guides like NBC, ASHRAE 62.2, HRAI, TECA, OBC-SB12, etc) that fairly compare the performance of multiple products in a category. I think the minority of consumers that you are probably referring to are DIYs (retrofits, offgrid, mobile home, etc) who are not the original target of the HVI program.
I do a lot of commercial projects involving air handlers and dedicated outdoor air systems. There are programs from AMCA (Air Movement & Control Association) and AHRI (Air-Conditioning, Heating, and Refrigeration Institute) to certify commercial ventilation products. Those ones are more liberal because manufacturers can have their labs and testing methods certified, by AMCA for example, to self affix a performance sticker from their AMCA-certified lab. Some have claimed that the business model implies that the manufacturer "pays for the sticker" which is way more unreliable as compared to HVI.
I appreciate the discussion in the forum but I think it is dangerous to lump and label all certification schemes as being manipulative.
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