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What is SAP (Standard Assessment Procedure)?

SAP is the UK Government’s standard methodology for home energy rating. SAP ratings allow comparisons of energy efficiency to be made, and can show the likely effect of improvements to a dwelling in terms of energy use. Local authorities, housing associations, and other landlords also use SAP ratings to estimate the energy efficiency of existing [...]

Ground to Air Heat Exchangers

A worthwhile investment? First of all, what the proponents say: ‘The Supply Air Duct is laid at a depth of 1.5m, where ground temperatures remain at 7-12° all year round. The air supply to the MVHR Unit can therefore be 7-9° warmer than atmosphere in winter and 12-14° cooler in summer, with pollen filtration included. [...]

Central vacuuming could change commercial cleaning

Vac & Vent are pleased to be featured in The Cleanzine with an article about our partnership with Disan.  Read the full article here >>

Tumble dryers and MVHR systems

Can the exhaust from a tumble dryer be fed into an MVHR system to make use of the otherwise wasted heat? A nice idea because a lot of heat is exhausted to atmosphere from a tumble dryer. The MVHR system is balanced (or nearly so). The volume of air extracted from all the outlets matches [...]

MVHR and Conservatories

Like any other room in the house, the conservatory needs to be ventilated, whether it be part of the house or thermally separated. There is a popular misconception that air must be extracted from the conservatory in order to make use of the surplus heat which can then be redistributed throughout the rest of the [...]