ASD Design



Ventec Systems Ltd. are a supplier of specialist fire detection products to the UK fire trade & construction industry, primarily, a supplier of Aspirating Smoke Detection products. 

To provide quotations for the products that we supply, we do on occasion have to provide design advice. This policy details the conditions under which we submit our quotations.  




Appointed by Xtralis as a technical wholesaler of Vesda to the UK, a platinum partner with UTC for Airsense and a UK distributor for Wagner, Ventec Systems Ltd. aim to provide the best possible ASD solution to each individual project that we provide a quotation for. 




The quotations that we submit are based upon the documentation supplied, generally on the Request For Quotation (RFQ) detailed on the quotation that we submit. We do our best to check the suitability of the documentation submitted but we may make certain assumptions:-

  • Scaled Drawings: We always try to determine the correct scale of any drawings submitted but cannot guarantee or accept responsibility for the accuracy of any materials, dimensions, quantities and/or equipment that we provide. It is highly recommended that all dimensions & quantities are checked and verified before using any information within our quotation. 

  • Specifications: If a specification is provided, we will attempt to follow it as best we can but cannot guarantee that any advice provided by us meets the specification. If no specification is provided, we will offer the most suitable equipment based upon sensitivity, performance, reliability and costs. It is the responsibility of the company that receives and/or uses our quotation to ensure that it complies with any relevant specification.

  • Detector Class: If no EN54 classification is provided, we will estimate the most suitable class of detector for the individual project. If a classification cannot be established, our quotation will target Class C detection.


ASD Assessment


We carry out an initial assessment of any drawings that we receive. We will attempt, wherever possible, to ensure that any advice supplied by us complies to the relevant British Standard, however, It is the responsibility of the company using our quotation to ensure full compliance. 


  • If the protected ASD area is not clearly defined we will advise the most likely area of protection which should be checked for suitability.

  • Subject to scale, we will assess the size of the protected area. If the area is in excess of British Standards, we will advise the use of multiple detectors if possible. Zone sizes and coverage area should be checked and verified independently.

  • If there are no pipe routes, pipe layouts and/or sampling hole locations, we may advise where to add them if possible. Any pipe and sampling holes advised by us should be checked for compliance and are to be used for estimating quantities only.

  • Subject to scale we will always try to ensure that your supplied pipe layouts are within the tolerance for the detectors used. Pipe layout measurements are taken from 2D drawings and may not be accurate.

  • The locations of sampling pipes and sampling holes will be checked for compliance with the relevant British Standard where possible. If no standard is provided, we will check compliance with BS5839.

  • The number of sampling holes per detector will be checked against the relevant detector class limit. Where no class is defined, hole quantities will be checked against an assumed class. Where no specific class can be assumed, sampling hole quantities will be checked against class C.

  • Where the height of the pipework is unknown by us, we will take our best estimation of the building height. Pipework lengths, quantities and detector suitability should be thoroughly checked by the quotation recipient to validate our estimated heights.

  • Unless we are specifically instructed otherwise we will generally assume that all ceilings/roofs are flat with no Apex or structural obstacles. We do not examine drawings and/or specifications for roof details and it is the quotation recipients responsibility to bring any details to our attention.

  • Our advice will assume that there are no air pressure differentials and assume a normal free flow of air throughout the protected environment.


ASD Design


Where an ASD design/layout has been provided to us and we attempt a material take-off (MTO) then scales and quantities of any MTO should be checked and verified.  

Where no design/layout has been provided, we will work with you to advise on best positioning to enable a concept layout to be produced. Any layout advice should not be relied upon as a design for an Aspirating Smoke Detection system and a full design from accurately scaled drawings should be carried out by the responsible fire alarm contractor.

Any equipment schedule provided by us should be used as a guide for estimating purposes only. It is the recipients' responsibility to check the accuracy from accurately scaled drawings prior to relying on information provided by us. 

Unless specifically requested otherwise, any equipment that we detail will be suitable for signalling Fire & Fault conditions, via relays only, to a conventional or addressable Fire Alarm Control Panel. Power supply standby times will generally be calculated for a 24-hour standby period and should be checked by the responsible fire alarm contractor / responsible designer. 

Due to the different specifications and requirements of different manufacturers, any equipment recommended by us is based upon pipe lengths, hole quantities and operational parameters of the respective aspirating detectors and may not be appropriate for other ASD systems not detailed within our quotation.


Any documentation supplied by us should be checked and calculated through the respective manufacturer's calculation software prior to project commencement. Ventec Systems Ltd. are able to advise about specific calculations should our quotation prove successful.


Contact Information


Should you wish to know more about our design service, you can contact us here.

© 2020 Ventec Systems Ltd. | United Kingdom

  • Black Twitter Icon
  • Black LinkedIn Icon