I have a small room in which a shower pump is located. This room is only separated from the rest of the house by a wooden door. The shower pump is located on top of some sort of vibration dampening material, which is itself located on top of a layer of plywood which is then placed on the wooden floor.
The pump makes quite a loud noise while in operation and is very annoying to anyone in the flat. It is a Salamander CT50 (or very similar). Here's the culprit:
I want to somehow soundproof that door in order to reduce the noise. Considering the way the pump is placed, I would exclude the noise being transmitted through the floor. Hence I would assume there's only noise transmitted through the air.
I am renting the flat so changing the pump or making some sort of serious modifications is not an option.
I've already fitted a draught excluder under the door which can be seen in the picture as well. It is one of these.
I was thinking of also fitting some draught excluder tape on the side of the door frame and maybe some sort of sound dampening foam on the door but I'm not sure this is the way to go. There are about 3mm of space between the door and the frame.
How would you recommend to soundproof the door from the pump noises?