Compatible Replacement for Part # W660-0052 Compatible with the Napoleon NPI40, Napoleon NPI45, Napoleon NPS40, Napoleon NPS45, Napoleon TPS35 Economizer, Timberwolf TPI35 Economizer, Timberwolf TPS35 Economizer Low Limit:140 degrees USA-Based Seller With 7 Days-a-Week Customer Support Low-Limit (140F) Exhaust Switch W660-0052 Napoleon Pellet Stove for models: NPS40 and NPI40 - Compatible with the Napoleon NPI40, Napoleon NPI45, Napoleon NPS40, Napoleon NPS45, Napoleon TPS35 Economizer, Timberwolf TPI35 Economizer, Timberwolf TPS35 Economizer Low Limit:140 degrees