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Community and Q&A

Through Wall Spot HRV…Amazing! But I have a few questions…

Zac Shore | Posted in Green Products and Materials on

Are you familiar with this product?

It is a through-wall HRV with an embedded ceramic plate. The way it works is it reverses its flow every 70 seconds, sending air through the ceramic plate and using its thermal mass as a heat exchange.

I am wondering if anybody has used this product and has any comments?

Also, the big question is, does this thing meet ASHRAE 62.2 requirements?


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  1. GBA Editor
    Martin Holladay | | #1

    GBA reviewed the Lunos fan back in 2011. Here is a link to the review: European Products for Building Tight Homes.

    At least two other GBA articles also mention the Lunos fan:

    Designing a Good Ventilation System

    Passivhaus Practitioners Share Their Success Stories

    Yes, you can use Lunos fans to create a ventilation system that meets ASHRAE 62.2 requirements. The standard requires at least 7.5 cfm per occupant plus 3 cfm for every 100 square feet of occupiable floor area.

    Each pair of Lunos fans provides only 17.6 cfm of ventilation, so you will usually need at least 4 pairs of the fans, depending on the size of your house. That gets expensive.

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