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These Vent Hardware Kits are ideal for situations where you need to drill out the rivets used to secure the vent screens and need to re-secure them afterwards. The vented enclosures require shorter screws as they are only securing the filter screens and do not need the extra length needed for securing a fan.The 14-18" Kits include four #6 Stainless Steel Screws and four #6 Speed Nuts & the 20" Kits include four #6 Stainless Steel Screws and four #8 Speed Nuts.