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Frequently Asked Questions
What makes carryover effectively zero?
Nothing carries air between the streams.
Plates or a membrane separate them permanently.
No surface rotates from one side to the other.
The airstreams never share a passage.
That is structural, not a control setting.
A wheel cannot match it.
Where is that a requirement rather than a benefit?
Wherever exhaust must not reach supply.
Laboratory extract adjacent to fume handling.
Hospital and clinical areas.
Industrial processes with contaminated exhaust.
Anywhere odour transfer is unacceptable.
Those applications rule out a wheel.
What maintenance disappears?
Everything associated with rotation.
No drive belt to stretch or break.
No motor and no bearings.
No rotation sensing needed.
Nothing that can silently stop.
Filters remain the main consumable.
What is given up against a wheel?
Transfer, and space.
A plate device recovers meaningfully less.
It needs plate area to do it.
A wheel packs more surface into less volume.
Plant room space often decides between them.
So does whether carryover is acceptable.
What is the frost problem?
Exhaust side condensate freezing in cold weather.
Cold incoming air chills the plates.
Condensate forms and then freezes.
Frozen channels block airflow progressively.
Preheat, bypass or defrost cycles handle it.
Design the strategy, do not discover it.
Do plate devices transfer moisture?
Only membrane cores do.
Metal plates transfer heat alone.
Membrane material passes water vapour too.
That gives enthalpy performance without a wheel.
It keeps the zero carryover property.
Confirm which construction is offered.
What cleaning do they need?
Surface cleaning, at intervals set by the air.
Grease-laden exhaust fouls fastest.
Some cores are washable, others are not.
Access to withdraw the core is required.
Filters upstream extend the interval greatly.
Confirm the cleaning method before purchase.