For central forced heating and cooling systems, our curved, clear plastic deflector directs air for added comfort and to save energy Sturdy polycarbonite construction with a removable filter to help trap dust, pollen and lint at register Held in place over your vent with powerful, permanent-strength magnets 2-3/4” tall, width adjustable from 10” to 14”; You can add up to 12” of additional width with our extension sleeve (part #67 - sold separately) For floor vents, direct air away from windows and furniture; For wall vents, direct warm air down during the winter and cold air up during the summer Returns will not be honored on this closeout item