Installation Hint for 1 1/2 inch vents

When installing a CQ on a smaller vent, centering is important. Here is a hint to assure its centered.
Put the front screw in about 3/8 inch is left out. Push the unit back until the front screw makes contact with the lead flashing, then install the side screws all the way. Then tighten the front.
Of course, if you can get all 4 screws in this is not required.