BlowerDoor Advent Puzzle

Take part and win!

The BlowerDoor Advent Calendar contains a daily question on the topic of airtightness. Enter the answers in the crossword puzzle and send us the solution word by e-mail. Closing date: 10 January 2024. We will be giving away 10 merchandise vouchers worth EUR 100 each among all senders with the correct solution word (redeemable in our shop at

Good luck - our fingers are crossed!

Download Advent Puzzle
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Conditions of participation

Radioactive chemical element that endangers health when it accumulates in poorly ventilated rooms

What is the name of the software for determining the holding time of extinguishing gases available at BlowerDoor GmbH? 

Conditions of participation

The competition is held by BlowerDoor GmbH in the period of 01/12/2023 to 10/01/2024. Please send the solution word by e-mail (subject: Advent Puzzle) to info(at) with your complete address by 10 January 2024.

Minors and employees of BlowerDoor GmbH are excluded from participation. Winners will be drawn by lot and notified by e-mail. BlowerDoor GmbH will not store any personal data of the raffle participants beyond the promotion period with the exception of the addresses of the winners. The voucher is not retroactively redeemable. A cash payment is not possible.

The legal process is excluded.