KVM

We're a small company. We had a health and safety advisor come out to do a general assessment. He noticed that there was no intumescent strip or smoke seal on one of our doors. Our H&S advisor recommended that we do not fit them ourselves, I spoke to the company who did our fire alarms and they do not offer any kind of service to fit this for us. Could anyone point me in the right direction of what kind of company would be able to help me?