Now you can have your own customizable, laser cut ventilation duct covers complete with an adjustable damper to control airflow! Print them with any medium thickness Proofgrade. Includes the adjustable damper that controls the airflow (or closes it off completely) as well as 4 different cover designs. This laser cutting template supports vent openings that are 2" x 12" in size. There are other designs in the Glowforge catalog that support additional sizes (4" x 12", 4" x 10" and 2" x 10").