HeatStar 20" Duct Adapter for HS4000ID SKU: F151045
HeatStar Dual Duct Adapter 12" SKU: F151032
HeatStar Dual Duct Adapter 12" - HSP Pro-Series SKU: F105117
HeatStar Dual Duct Adapter 16" / 16" SKU: F151042
HeatStar Single Duct Adapter - HSP Pro-Series SKU: F105111
HeatStar Single Duct Adapter for HSP70ID SKU: F105107