ゆう あつ換気 かんき せんではありませんでした
yūatsukankisendewārimasendeshita

Noun
Desu Copula

The polite, past negative form of 有圧換気扇

1. Was not a pressure ventilation fan.; Was not a forced-draft fan.

Past/Perfective
Negative
Polite
Formal Register