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WebGas Fittings & Spares. Gas Detection Equipment; Gas Fittings & Accessories; Gas Hose & Copper Tube; ... MPK Vent 5038. 117mm Diameter (Overall) Cut-out diameter 80 mm.Colour ... £19.42 Off. Electrolux GY20 Vent. for a 130mm hole cut out. Electrolux GY20 Vent. A passive ventilato (1 review) Web27 Feb 2024 · In our opinion, the ideal location to site your MVHR unit in a home is in a utility/plant room on the north side of the building close to an external wall. The reason we prefer it on the north elevation is to improve the efficiency of the automatic summer bypass function that all our MVHR units have built in. Webvent. These appliances are typically 87 to 97% efficient and are vented with plastic, stainless steel, or a material other than Class B or masonry. Vent installation must follow manufacturer’s instructions.” National Fuel Gas Code Table 10.4.1 “Category II, III, and IV gas utilization equipment shall be vented using materials mannix library