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We are a self build so used http://www.bpcventilation.com who did the plan and supplied and we installed it. Works best with good detailing to airtightness and increased insulation so make sure that factors in your build. No point paying £1000’s to be sucking in cold air through gaps.
bpcventilation.com
BPC Ventilation: Heat Recovery Systems | Home Ventilation System
We are the leading independent suppliers and designers of heat recovery systems to domestic and commercial applications suitable for trade or DIY.