8.4 Ventilation

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8.4.1 Mechanical ventilation and heat recovery (MVHR)

MVHR (Mechanical Ventilation with Heat Recovery) systems provides fresh filtered air into a building whilst retaining most of the energy that has already been used in heating the air within the building see figure 1 & 2.

Figure 1: MVHR schematic

Figure 1: MVHR schematic

Figure 2: MVHR schematic layout

Figure 2: MVHR schematic layout

Definitions for MVHR#

Air valve
(extract and supply)		Wall or ceiling mounted fittings used to balance the flow rate of air between rooms; may be referred to as grilles or diffusers
Exhaust ductworkCarries air from the fan unit and exhausts it to the external atmosphere
Intake ductworkCarries air from the external atmosphere to the MVHR fan unit
MVHR fan unitUnit that contains the fan(s), heat exchanger and filter(s)
Service ductwork extract and supplyCarries air between the air valves and the MVHR fan unit
Terminal fittingsLocated on the outside of the building to finish the intake and exhaust ductwork

Clauses for 8.4.1 Mechanical ventilation and heat recovery (MVHR)

Last updated: 2nd January 2024

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