Archive for the ‘Loft Exhaust Fan Installation’ Category

postheadericon Loft Exhaust Fan Installation

Article supplied by London loft conversion specialists:

Loft exhaust fans are available in two types: gable-end and roof-mounted. A gable-end fan is installed inside the loft, with a louvered opening to the outside. A roof-mounted loft fan is positioned near the top of the roof, under an aluminium mushroom cap that protects the fan from the elements. Adjustable thermostats on the fans control both kinds. The temperature in the loft causes the thermostat to turn the fan on and off to remove hot air from the loft.

First you will need to select a roof-mounted exhaust fan recommended for the cubic footage of the loft. The fan should be adequate to efficiently pull out hot air. It may be necessary to install two or three roof-mounted exhaust fans. Two fans running intermittently is more energy efficient than one fan running nonstop.

Next you have to determine where on the roof the fan will be installed. Hot air rises to the peak of the loft ceiling. The higher on the roof and the closer to the ridge, the better.

It is important to verify that the manufacturer’s specifications for the circuit breaker size are met; a 20-amp breaker and No. 12 wire is standard. Run power from the home’s electric service panel to the location where the roof-mounted exhaust fan will be installed. The fan installation will include a hot wire, a ground wire and a neutral wire, connected to the service panel and circuit breaker and to the fan.

Using a reciprocating saw or a power saw, cut a vent hole in the roof where the exhaust fan will be located. A hole measuring 12 inches square is standard.

Once the hole is made, nail the mushroom cap with roofing nails, tucking the cap under the head shingles. Follow any diagram accompanying the exhaust fan assembly for flashing specifications. Apply roofing tar to seal the mushroom cap valance.

Mount the exhaust fan assembly, working from inside the loft, using the brackets and screws provided by the manufacturer.

Turn off the electricity to the exhaust fan at the circuit breaker. Wire electrical connections to the thermostat; twist the wires to connect neutral to neutral, hot to hot and ground to ground wires. Screw on wire nuts and wrap with electric tape. Do not allow the electric feed to hang; apply supports following local building codes.