Air Pressure Stabilisers
APSX®-FSS (Smoke Fire Rated)
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The APSX®-FSS-123 model of Air Pressure Stabiliser has been added to the Apreco range following extensive feedback from the healthcare market. The need to protect patients and staff in the event of a fire is of paramount importance, our new APSX®-FSS-123 with its sleek compact design has been well received from Clients, Designers and Infection Control personnel.
The design philosophy behind the APSX®-FSS-123 has been developed following consultation with M&E consultants and contractors with the assistance of WarringtonFire; world renowned experts in the testing of fire/smoke rated products for the construction industry.
We looked at the current testing approach to fire damper/shutter products and concluded that they are generally covered by BS EN 1366-2:2015 which relates to the ability of a fire damper to prevent fire and smoke spreading from one compartment to another through the air ductwork systems.
Whereas an operating theatre Air Pressure Stabiliser is there to provide ‘door’ flow-protection and is invariably located next to a door with a 30- or 60-minute fire rating and not in the air ductwork system.
The Air Pressure Stabiliser is therefore acting more as an Air Transfer Grille than a Damper. So, to provide a product tested in a manner for the environment it was designed for, we adopted the following test protocols to evaluate the APSX®-FSS-123: Fire Integrity Test to BSEN 1364-5: 2017 (WarringtonFire Test 412865) Smoke Leakage Test to BSEN 1634-3: 2004 (WarringtonFire Test 605852)
The VARI-centric® range of Pressure Stabilisers is purpose-designed for Operating Theatre Suites to control airborne contamination by controlling room pressure differentials.
Fire Integrity Test installation of APSX®-FSS-123 at Element Warringtion FireThe VARI-centric® balancing system accurately controls the differential air pressure between adjacent rooms, and the blades close fully as soon as the pressure differential drops below the required level.
This diverts the airflow to pass through an open door forcing back airborne contamination without the need to alter the air extract supply. Positive pressure of the Operating Theatres to protect them from the ingress of infectious agents passing through the open doors, by providing high air volume rates, is a well-established principle of hygiene and infection control, forming the fundamental principles on which Health Technical Memorandums HTM 03-01 & HTM 2025 are based.
Apreco VARI-centric® Pressure Stabilisers and associated products are supplied as standard with SteriTouch® anti-microbial paint finish, utilising silver technology – which is already used extensively within the healthcare sector as an excellent anti-microbial protection in conjunction with good hygiene practices. SteriTouch® is extremely effective in helping to protect against harmful bacteria including MRSA, Ecoli, Salmonella and C-diff
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Operating Theatres
The VARI-centric® Bespoke Air Pressure Stabilisers are utilised to maintain the positive pressurisation of operating theatres and isolation rooms, to protect them from the ingress of infectious agents passing through open doors by providing high air volume flow rates is a well-established principle of hygiene and infection control.
Apreco have been acknowledged for their assistance in contributing to Health Technical Memorandum (HTM 03-01) which supercedes HTM 2025. They have also assisted with the validation of Isolation Room design following Health Building Notes (HBN 4 : Supplement 1).
Clean Rooms
Apreco’s leading VARI-centric® range of Bespoke Air Pressure Stabilisers are designed to maintain a sterile environment. Our range is utilised in the cleanrooms of pharmaceutical, healthcare and commercial companies for effective room differential pressure control.
All cleanroom areas should be either classified or non-classified. All classified areas should conform to an applicable standard. This standard is dependant upon geographic location and usage.
Isolation Rooms
When following the guidelines of HBN4 Supplement 1: Isolation facilites in acute settings the VARI-centric Bespoke Air Pressure Stabilisers are utilised to maintain the positive pressurisation lobby ensuring that air from the corridor does not enter the isolation room, and that air from the room does not escape into the corridor. This basic but effective design enables the suite to be used for both source and protective isolation without the need for switchable ventilation or special training for staff. Importantly it also provides safe isolation for those patients whose exact condition is unknown.
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Metric Selection
The method below will give you an indication of the size of unit required for a given volume flow-rate at a given pressure.
Use Table A to calculate the total length of blade required, and then divide it into sections of equal length using values from Table B.
Example:
Selecting a Pressure Stabiliser capable of transferring 310 l/s (0.31 m3/s) @ 5 Pa.Stage 1:
310 x 7.35 = 2278.5 mm of total blade length.Where: 310 = Volume in l/s and 7.35 = Factor from Table A relating to 5 Pa.Stage 2:
Divide the calculated total blade length into equal lengths using one of the standard blade lengths from Table B.Consideration should be made regarding any physical restrictions that the building may impose before selecting the blade length for the unit.
Total calculated blade length of 2278.5 divided by 4 blades = 569.25 mm.
Rounded up to the nearest standard blade increment from Table B gives you 4 x 575 blades.
Table A (Factors)
Pa Factor Pa Factor Pa Factor 3 9.49 15 4.25 35 2.78 5 7.35 20 3.68 8 5.81 22 3.51 10 5.20 25 3.29 11 4.96 30 3.00 14 4.39 32 2.91 Table B (Blade Lengths in mm)
200 350 500 625 250 400 550 675 300 450 575 750 Imperial Selection
The method below will give you an indication of the size of unit required for a given volume flow-rate at a given pressure.
Use Table A to calculate the total length of blade required, and then divide it into sections of equal length using values from Table B.
Example:
Selecting a Pressure Stabiliser capable of transferring 657cfm @ 0.020 in wc.Stage 1:
657 x 0.137 = 90 inches of total blade length.Where: 657 = Volume in cfm and 0.137 = Factor from Table A relating to 0.020 in wc.Stage 2:
Divide the calculated total blade length into equal lengths using one of the standard blade lengths from Table B.Consideration should be made regarding any physical restrictions that the building may impose before selecting the blade length for the unit.
Total calculated blade length of 90 divided by 4 blades = 22.5in.
Rounded up to the nearest standard blade increment from Table B gives you 4 x 22.64in blades.
Table A (Factors)
in wc Factor in wc Factor in wc Factor 0.012 0.176 0.060 0.079 0.141 0.052 0.020 0.137 0.080 0.068 0.032 0.108 0.088 0.065 0.040 0.097 0.100 0.061 0.044 0.092 0.120 0.056 0.056 0.082 0.128 0.054 Table B (Blade Lengths in inches)
7.87 13.78 19.69 26.57 9.84 15.75 22.64 29.53 11.81 17.72 24.61 -
X-Ray Protection Baffle Screen
Apreco provide purpose designed lead-lined screens mounted in front of the stabiliser to protect personnel from harmful X-rays.
Laser Protection Screen
Apreco provide purpose designed screens mounted in front of the stabiliser to protect personnel from harmful laser-rays.
Protective Guard
The guards are designed to offer protection to Bespoke Air Pressure Stabilisers when fitted in areas where they may be classed as vulnerable to accidental damage.
Fumigation Sealing Plate
Designed to seal against one client nominated side of a Bespoke Air Pressure Stabiliser, these plates are typically required when a facility requires one or more of its rooms/areas to undergo a fumigation process, to protect adjacent rooms/areas from the ingress of fumigant.
Baffle Screen
The Baffle Screen has been designed to divert the air from the Bespoke Air Pressure Stabilisers reducing jetting whilst allowing the Bespoke Air Pressure Stabilisers to function correctly.
Light Baffle
The Light Baffle has been designed to block the light from one room entering another. Used in applications where protected rooms must be kept dimly lit.
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