Semi-rigid aluminum duct is ideal for applications where building codes require use of all aluminum duct. The duct is totally non-combustible with a maximum operating temperature of 400 deg F.

Lambro Duct Preferred Hood Vent Kit, Flexible Semi-Rigid, Domestic

• Opening or closing damper prevents outside elements from entering the vent
• 4-1/2 in hood opening

• Instruction/Installation Manual https://www.hirsch.com//ASSETS/DOCUMENTS/ITEMS/EN/https://assets.unilogcorp.com/2/ITEM/DOC/Lambro_349L_Manual.pdf