MVHR indoor humidity

Mechanical ventilation: not the first buy for wet windows

What MVHR does to indoor vapour, what it does not do to rising damp and leaks, and why Qordac has no invented plant partners.

Updated 2026-09-01 · 7 min read

MVHR changes air continuously. It cuts indoor vapour in tight envelopes. It does not dry a wall wet from below, and it is not a gadget to buy after an article.

For a studio with wet glass, the sequence stays: measure, air, maybe an extractor, maybe a dehumidifier. MVHR belongs in a project, not a shopping cart.

First check whether this is indoor vapour

FAQ

Will Qordac send an installer?+

No. There are no partners. If a lead channel is connected later, it will be labelled — no fake lists.

What may help (after diagnosis)

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45–80 €

Bosch 1500 DH Ø100 mm (humidistat + timer)

Example bathroom extractor with humidity sensor and timer. In a windowless bath it removes vapour at the source: a living-room dehumidifier barely sees that room. Not a lab review and not an installation design.

When: Mould on silicone or the mirror, daily showers, windowless bath, an outside discharge already there or still to be made.

Not when: A thermal bridge in a bedroom, rising damp, a discharge into a sealed void. It does not replace whole-home MVHR.

View on Amazon.it

Amazon.it affiliate link (tag qordac21-21): we may earn a commission, at no extra cost to you. A category example, not a lab review. Amazon.com is not used.

10–25 €

TempPro / ThermoPro TP50

Example desktop hygrometer for diagnosis. Without a relative-humidity number every tip is guesswork. Not a lab review.

When: Always, as the first diagnostic step.

Not when: It does not replace a moisture meter or a rising-damp survey.