VR DoorFast action roller doors, also known as ‘speed doors’, facilitate easy and rapid access to and from environmentally-controlled buildings or rooms whilst minimising temperature changes compared with slower acting doors. They are ideally suited to application such as avoiding heat loss in a warehouse or distribution centres to protecting the refrigerated rooms and the sensitive environments required in the pharmaceutical industry.
For internal use where air pressure differentiation is low, the most common solution is a PVC curtain above the door frame. For external use where the doors are subject to wind load a vertical stacking mechanism is recommended as this offers Standard Class 1 wind resistance.
Since prevention of heat loss is an important reason for specifying such doors, the PVC canvas insulation value and minimising of air leakage around the edge are important. The canvas used on the HAG VR and HAG VL ranges of fast action roller doors has a density of 950 g/m² and offer the low heat transfer coefficient (thermal admittance) of 0.045 W/m² ºC (for comparison purposes this is approximately two-thirds the insulating properties of standard double glazing which is rather impressive). Leakage around the sides is minimized by close-fitting nylon brushes. The operational temperature range is important especially when protecting refrigerated premises the standard range is -30 to +70 ºC.
High speed doors can be fitted in conjunction with sectional overhead doors to provide an excellent combination of security, protection and ease of access.
Each door is custom-designed to each application. These are the most common customisations that can be specified
Where wind load resistance is immaterial or minimal then the aperture may be up to 25m² in area with the maximum horizontal or vertical dimension being 5000mm. This is reduced to 4000mm where Standard Class 0 or 1 wind load resistance is required. If you require a door for a larger aperture and or higher wind loading resistance then the HAG VL range is recommended.
Each vertical rolling door is available in 13 RAL colours for the PVC with matching power coating for metal work. Each is specified to M2 self-extinguishing fire resistance. Transparent vision panels can be fitted to allow daylight through the door or when sight through the door is required for safety and security reasons. Doors may additionally be painted with signage or logo graphics.
The door mechanism is powered by a 400VAC or 230VAC electric motor and brake. In the event of power failure the door can be opened by manual via a hand-operated chain or crank (depending on specification). Programmable options included the pause time in the open position and two-third’s and partial opening positions.
The doors can be configured to open at up to 1 m/s and close at 0.6 m/s (with a deceleration of 0.6 m/s²).
The opening and closing can be controlled by a wide range of devices that include:
Multiple doors may be inter-lined to offer ‘air lock’ or sequential operation and sequenced with existing plant or processes.
Safety of operators and users is of paramount importance. Depending on specification, each door is fitted with high visibility lower edge and visible (and optionally audible alarms) beacons that operate two seconds prior to the door opening or closing. In addition there is an ‘anti-drag’ photocell detector as standard. Should one of the specified safety devices on the bottom edge of the door (eg photocell, contact safety edge) detect an obstruction during door closure, it is rapidly braked and reversed. This is sometimes referred to as ‘Crash-out and auto reset’.
So whether you require a high speed door for a chilled room, garden centre, paint room, gantry or food manufacturing plant, HAG’s product range and design and installation expertise is available. Please get in touch to discuss your requirements or seek our advice with specifying.
Call now on 0800 072 3444.
HAG offers a wide range of products and services, if you would like further information call 0800 072 3444 now to speak to a member of our team.