To ensure your pet's safety, regularly check all kennel parts and doors for replacement. This Replacement Vent is designed specifically for use with the Indigo® Dog House Sizes: MED (37.5" x 30.5" x 22.8"), LG (43.75" x 34" x 25.8") and XL (51.5" x 39.3" x 30"). To ensure a proper fit, be sure to match your pet's shelter size with the appropriate product/item number for this replacement vent. Does not include hardware. Use original hardware that came with the dog house.