Recently we worked on a project which had a design approach that we often see — the design of high use access control fire rated doors. In this case, the designers were looking to use 60mm backset electric mortice locks with 50mm round rose lever furniture. The round rose was either chosen for aesthetic consideration or was introduced as a cost savings measure.
For access control doors, the NZBC and NZS 4520 stipulate that doors have to be free at all times and either require lever handles or to be electronically controlled. We discussed this with the relevant consultants and recommended a solution that eliminated the electric mortice lock and round rose furniture, instead opting for a push pull handle in conjunction with an electro magnetic lock and fire rated roller door catch. A further alternative could have been an electric drop bolt or electric cobalt.
When pairing door furniture with electric mortice locks on fire rated access control doors, I recommend taking a 'good, better, best' approach.
The good approach is the specification of diecast commercial, round rose lever furniture — ideal if it is the desired aesthetic, on access control doors that have low to moderate usage. The better approach is the specification of stainless steel or brass commercial, round rose lever furniture — ideal if it is the desired aesthetic, on access control doors that have moderate usage. Stainless steel has the benefit of being robust, long-lasting and more resistant to bacteria, making it suitable for application in hospital applications.
The best and most common approach is the specification of stainless steel or brass commercial plate furniture. Plate furniture is ideal for high-use applications as it is more robust and resistant to vandalism than other options. You can match the lever between rose and plate furniture to aid in maintaining desired aesthetic if required, leaving you with an access control door suitable for most commercial applications.