We found one dictionary that defines the word return duct:

Tech (1 matching dictionary)

1. Glossary of Energy Terms (No longer online)

▸ Words similar to return duct ▸ Usage examples for return duct ▸ Idioms related to return duct ▸ Wikipedia articles (New!) ▸ Words that often appear near return duct ▸ Rhymes of return duct ▸ Invented words related to return duct