Bathroom Soffit Vent Installation

The Soffit Vent by Moisture Flow® is designed to fit an eight-inch soffit to a 48 inch soffit. The Soffit Vent is designed to be used as a Retrofit for existing homes or for new construction. Installation of the Soffit Vent only requires small hand tools.

Bathroom Soffit Vent Installation

Step 1

Locate the rafters inside the soffit. This can be done by standing in the attic and locating them in the soffit. From the exterior of the home this gives you an idea of where they are located in the soffit area. The rafters are 16 inch on center.

Bathroom Soffit Vent Installation

Soffit Vent Installation

Soffit Exhaust Vent

Soffit Exhaust Vent

Step 2

Using a tape measure from the interior side of the fascia backwards to the soffit 4 3/4 inches. Using a pencil measuring 4 3/4 inches back from the interior side of the fascia on the soffit. Make sure that there is a clearance of 2 1/4 inches away from the rafter.

Bathroom Exhaust Fan Soffit Vent

Step 3

Using a hand drill place a 4 1/2 inch hole saw with a pilot drill bit place it on the pencil mark.

Bathroom Soffit Exhaust Vent

Exhaust Fan Eave Vent

If replacing an obsolete vent that is already in place see if the existing hole meets the specified measurements of the new soffit vent. If not, remove the old vent, close up the hole and make a new hole.

If the existing ductwork is old or faded it is suggested that you buy a new one. If replacing the extension tube start by inserting it into the hold of the neck of the vent pushing it into the attic. This will give a better access to reaching it. When pulling it into the attic do not damage the exterior covering when pulling it through the hole in the soffit. Two people might be necessary, one pushing from the exterior and the other pulling it within the attic.

Pull the extension tube until it reaches the exhaust fan. Take the end of the ductwork and place it on the neck of the exhaust fan. Attach it securely with a jubilee clip and tighten the screw to hold it in place.

Exhaust Fan Soffit Vent

Brands of ductwork vary depending on the ductwork that is in place, Normally the ductwork for a bathroom exhaust fan has a thin membrane shelve in the interior of a plastic tube. Others have plastic tube with wrapped in insulation and a aluminum

Bath Fan Soffit Vent

Step 4

After the extension tube is attached to the exhaust fan, lf the ductwork needs to be replaced, place the end from the soffit and slide it on to the neck of the housing. The neck of the housing is the part that will be inserted into the soffit with the attached extension tube. If the extension tube has an interior lining, place it on the neck and slide down to the base of the housing. It is suggested to wrap the lining and the neck of the housing preventing it from pulling away from the neck of the vent.

Slide the ·exterior covering down over the interior lining and using either duct tape,
nylon tie or a jubilee clip secure it to the soffit vent.

Bathroom Soffit Vent

Step 5

Present the soffit vent in place with the bevel on the nose pushing it up against the interior of the fascia The grille of the Soffit Vent should extend the exterior side of the fascia. The grille will extend past the fascia so that it can be removed should it ever need to be cleaned from debris that may collect on it. The grill is held in place by three clips at the bottom on the grille.

Insert the neck to vent into the soffit and where the nose of the vent meets the fascia the bottom edge of the fascia should sit on the base of the nose. If the bottom of the fascia extends more than 1/2 inch below the soffit, notch out the difference so that the vent is flush up against the soffit. The vent should be level with the soffit.

Bathroom Soffit Vent

Step 6

Once the vent is correctly installed pull the neck of the housing out and using an
exterior silicone caulk put a bead around the diameter on the base of the housing to
seal the space of the opening in the soffit around the neck of the vent.

Push the extension tube into the soffit making sure not to bend the material. Press the neck of the Soffit Vent firmly against the soffit so the bead of Silicone completely seals the excess opening around the neck of the vent bonds to the vent and the soffit.

On both sides of the nose of the vent are two holes to screw the vent into the 2 X 4 frame of the soffit. If the bottom of the fascia is butted up against the bevel in the nose the screws will line up with the 1 1/2 inch 2 x 4 of the exterior framework of the fascia.

Step 7

Using a # 8 screw, 1 1/2 inch Stainless steel, screw the Soffit Vent to the soffit. There are two holes on the housing that can also be used if needed. However, the silicon and the two screws in place will hold the vent in place. The additional screws can be used if needed. Once the vent is in place caulk any openings around the vent sealing all open spaces to prevent insects from entering into the soffit.

Soffit Bath Vent

Step 8

The Soffit Vent is now in place and operational.