Control high limit and fan motors in forced air heating systems.</br>Fan and limit controller. 8 inch insert.</br>Field adjustable fan and high limit settings.</br></br>Product Description</br></br>This is an O.E.M. authorized part. Fits various Honeywell models . OEM Part Number L4064B2236. This product is manufactured in USA.</br><br/>http://www.amazon.com/gp/product/B0009726EW