Airtight installation of basement doors

Hi,
I need to install my doors to the unheated basement rooms airtight.
I don't know which doors I need and how to install them.
Despite research, I haven't gotten any wiser.
Can someone help me with that?
See also attachment

Hello, what exactly do you want to know? There are plenty of providers for such doors on the market.

Can I just use a normal basement steel door or are there special airtight doors? I also looked in hardware stores over the weekend and there I only find climate doors, soundproof doors, and fire protection doors for the basement.

I have installed a climate class 2 door with Schallex sealing between the basement and the granny flat. You can still hear the washing machine very quietly. What you definitely must do is fully foam the frame.

Hi,

we recently had our technical room door (accessible from the outside) installed. Since the technical room is part of the insulated building envelope, the door basically had to be designed like an entrance door (airtightness, insulation, etc...) and a

Because we absolutely wanted the look of a classic steel door there, in the end only one model remained that met the requirements: dw 62-1 "Teckentrup DF" iso+. The door has a drop seal and a very good Ud value: 0.83 W/(m²·K) with a sheet thickness of 0.75 mm. I think the price is more than OK compared to "side entrance doors" at about 1400 euros.

The installation was done with airtight foam (white) and additionally compression tape on the outside.
Last week was the Blower Door Test and there were no defects with the door.

Maybe this helps you further.

best regards