Shop gable vent fans in the gable vents accessories section of Lowes.com. Find quality gable vent fans online or in store..Triangle Gable Vent Our best seller! We also do right triangle gable vents half triangle and custom vents for applications where a standard triangle will not fit..Our gable vents can be manufactured in any shape, size and color. We specialize in beautiful products which are rugged, functional and stand the test of time. Have an idea?.Air Vent in Dia Electric Gable Vent Fan at Lowe’s. The gable mount power fan uses a thermostat to prevent heat build up. It operates more quietly with greater efficiency..