NICOR Lighting 4- Inch Remodel Lo-volt Airtight Housing Non-IC,Nicor Lighting,14101AR" /> Non-IC insulation must be kept a minimum of 3" from housing Use low voltage 20W- 50W MR16 or JC type lamps (12V). Lamps are not included Listed for through branch circuit wiring and includes several 3/4" knockouts Use dimmers specifically designed for low voltage magnetic transformers Airtight housing limits the exchange of air between ceiling plenum and heated/cooled areas