CV Air Freshener Refill - Citrus Scent A unique line of metered aerosol odor counteractants that don't just cover up odors but destroy them. Lasts 30 days. Ideal for use in veterinary hospitals, kennels and homes. One can adequately freshens a 30' x 20' x 10' room for one month. This refill works with the following Dispensers: The Country Vet Flying Insect &amp; Air Freshening Kits, (excluding the 2 oz dispensing kit). The Nilotron Aerosol Dispensing Kit.