If its a fire door then call it a fire door - it must be fitted with the fire door set and ironmongery that matches its fire safety certificate.
It is not good practice for a layperson to state that he's "getting the door leaf only" - it is a false economy to revise the specification unless you are competent to do so.
A fire door may seem only to be a piece of timber that plugs a hole, but the correct installation and effective sealing of the hole depends on a lot of things which work together to give the desired result.
- the density, integrity and fire resistance of the door itself
- the sealing and correct fitting of the lining and architrave
- the sizing and density of the frame into which it sits
- the sizing and effectiveness and completeness of any intumescent strips
- the effectiveness and completeness of the smoke seals
- the bedding of the ironmongery into intumescent paste or strips
- the quality of the ironmongery - hinges, self-closing device and handles
- the dimensional accuracy of the door and frame (the penny test)
- the plumbness and squareness into which the door will sit
- the integrity and fire reisitance of the wall into which it is placed
- the lack of a lock /presence of a tumbler operated mechanism from the inside.
- the presence or otherwise of alarm-deactivated electromagnetic door-holder-openers (especially if this door is in a corridor)
Don't skimp on a fire door or attendant items is the best advice I could offer.
- If the gap between the frame and the door is too great, neither smoke seal nor intumescent strip may work.
- If the frame and lining are not properly sealed to the wall, the door will be less effective.
- Unless there is a compliant security mechanism fitted [including press bars and tumbler locks] the door may help the building become a death trap.
- Only accept fire doors which have fire certs offered with them together with a specification for the fire door sets (ironmongery, fixing, seals, frames, grounds etc).
- Make sure these are correctly fitted by a competent person and inspected and certified after fitting by a competent building professional whose experience and qualification are suitable to that task.
All that having been said, fire doors are usually dimensionally stable within the standard ranges.
A fire door must be dimensionally stable in a fire emergency situation and so the build quality is higher.
One cannot obtain a fire rating for a non-standard door simply by interpolation of its composition.
A Fire Safety Cert may not be in place for the specific size of door and/or the timber material you require.
Your door may be a once off door design and you may be required to obtain an independent certificate for your once off door.
It must be tested individually, together with its ironmongery and door set and your budget and programme are secondary to this.
I have seen one or two contractors try to justify substandard items because of budgetary or time constraints - it never impresses.
The last time I oversaw a Fire Door Test we had to send the door away for testing and a Report to TRADA Chiltern.
We discovered that fast growing hardwoods have less density that European slow growing hardwoods and therefore less intrinsic fire resistance.
We had to revise the design and specification of the door to make it compliant, but if we hadn't tested it we wouldn't have known we had to do this.
I strongly suggest that you contact a competent experienced architect (some just do fire safety certificate applications) or reputable, qualified Fire Safety Consultant with experience in this area (some just do fire engineering solutions) for more advice on whether or not there may be a necessity for such a test, and how to go about it.
If you are dealing with a manufacturer who starts contradicting the advice I have offered, I would strongly advise taking retaining and then taking the advice of a competent building professional with experience in this area, as opposed to the guy who may be only trying to sell you a piece of timber.
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All advice on AAM is remote from the situation and cannot be relied upon as a defence or support - in and of itself - should legal action be taken.
Competent legal and building professionals should be asked to advise in Real Life with rights to inspect and issue reports on the matters at hand.