テラル株式会社 manufactures the dedicated 排煙送風機 range used in mechanical smoke-extract systems required under the Building Standards Act, and publishes the 日本建築センター rating number against each model — BCJ評定-BE0017 and BE0019 for its Mild backward-curved fans, BE0020 for the CLF2 sirocco, BE0024 for the AES4 axial and BE0034 for the ETF radial turbo. Established in 1950 with origins in 1918, it operates four factories and around 50 sales locations in Japan.