Doorbell Transformers

Doorbell Transformers—Insulation may contact the sides of but shall not cover doorbell transformers. • Masonry Chimneys—All insulation and blocking materials shall be kept a minimum of 3 inches away from masonry chimneys. When loose-fill insulation material is used for ceiling insulation, acceptable blocking materials shall be used to ensure a minimum 3-inch clearance. Unfaced mineral fiber batts may provide the minimum clearance by serving as blocking for loose-fill insulation, or other types of blocking may be used to ensure the minimum clearance. The gap (crack) between the interior ceiling finish material and the masonry chimney should be firestopped and sealed in accordance with locally adopted codes and regulations.  • Factory-Built (Metal) Chimneys—All insulation and blocking materials shall be kept a minimum of 3 inches away from factory-built chimneys. The minimum 3-inch clearance shall be provided by utilizing acceptable blocking materials. In some installations where loose-fill insulation is installed as ceiling insulation, the sides of the chimney support box may serve as the blocking material if it provides the minimum 3-inch clearance. Insulation shall not be installed in or over the chimney support box. • Vent Pipes from Gas or Oil-fired Furnaces, Water Heaters, etc—Insulation materials shall be installed no closer than 3 inches to a vent pipe, or the clearance specified on the vent pipe label, from a gas or oil-fired furnace, water heater, etc., where the vent pipe passes through the ceiling. When loose-fill materials are installed as ceiling insulation, acceptable blocking materials shall be used to provide the required clearance and to prevent the insulation material from falling into the cavity around the vent pipe. • Venting—Range hoods and bathroom exhaust fans shall be vented to the outside in conjunction with adding attic insulation. The vent pipes shall not be vented through an existing attic ventilator unless the minimum required net free area for the attic would still exist without the use of that ventilator. If a bathroom or kitchen is not properly vented to the outside, one of the following venting methods must be used: