HVAC Industry

Parsons have been supplying plastic ductwork systems for fume cupboard and corrosive ventilation applications since 1969. Parsons design and manufacture and install complete ductwork systems in accordance with:

	DW154z		BS 848 Performance Testing of Fans
	LGC1614		Industry Specific Codes
	DIN 1946		Parsons Ductwork Design Manual
	BS6821 Leakage Rates for Dampers

The range is the widest and most complete available from any manufacturer in the UK ductwork is available in circular section from 50mm to 4000 mm diameter and rectangular/square sections from 200mm to 4000 mm wide sides and consists of:

Plastic Ductwork fabricated from:
	UPVC •••	Sprinkler Protected Systems
	Polypropylene	Flame Retardant GRP
All ductwork is reinforced with GRP on larger duct sizes or for high pressure / temperature applications.

Ductwork Fittings for all of the above
	Bends	Fume Cupboard Connections
	Flexible Vibration Isolation Connections	Inspection/Cleaning Ports
	Flanges	Hoods
	Brackets	Transformations
	Shoe Sockets	Reduction Cones

Ventilation Equipment

Centrifugal Extract Fans in PVC/PP/PVDF/GRP

Acoustic Enclosures

Automatic Shutoff Dampers

Volume Control Butterfly Dampers 50mm to 450 dia

Axial Flow Extract Fans in PVC/PP

Vibration Isolation

Shutoff Dampers 50 mm to 4000 mm

Volume Control Multileaf Dampers 450mm to 4000mm

Bifurcated Fans in PVC/PP/GRP

Gas Scrubbing Equipment

Exhaust Stacks

Radial Multileaf Dampers 200 – 600 mm dia

Attenuators designed to BS 848 Pt II

Back Draught/ Non Return Dampers

Actuated Dampers – Electric/Pneumatic

Odour Abatement:

o	Chemical Scrubbing
o	Catalytic Assisted Scrubbing
o	Bio Scrubbers
o	Bio Filters o o o
o	Carbon Adsorbers
o	Thermal Oxidation
o	Catalytic Thermal Oxidation

Engineering Services
	Complete Ventilation Systems designed	Fan Selections
	Fan Performance Testing to BS 848 in house	Noise Testing
	Laser Studies of Sites and 3D AutoCAD Models Configured	Vibration Studies
	Construction Management	Noise Surveys
	Installation compliant with CDM Regulations	Site Surveys
	Ductwork Testing & Commissioning	Project Management

Parsons undertake total engineering packages cover all aspects of the project:
	Front End Design Study	Site Surveying
	Process Engineering	Construction Management
	Mechanical Engineering	Installation
	Exhaust Ductwork	CDM Compliance
	Supporting/Access Steel Structures	Commissioning
	Civil Requirements	Documentation
	Handover

The above list details the full services offered by Parsons and the client can select which elements they wish Parsons to provide and which they prefer to resource in-house, clear identification of responsibilities at an early stage of a project ensures project completion on time and on budget.

Parsons are equally experienced on Greenfield site projects, or replacement of existing equipment within a working production facility, both represent challenges. The importance of accurate site surveying is just as important in all cases. Parsons utilise state of the art “All Station” laser measuring devices, which are used by experienced engineers who then download the information into a 3D AutoCAD image that forms the basis of the design. Once the site survey has been completed the normal mechanical and process engineering procedures are undertaken to produce manufacturing drawings, during manufacture in Parsons factory the vessels are regularly inspected and dimensional laser checks are carried out and overlaid onto the site General Arrangement Drawings to ensure accurate interfacing.

Plastic Ductwork systems can be quite complex on larger Chemical Processing site’s and reliable flow control and isolation are demanded for safe plant operation Parsons manufacture a full range of manual and actuated dampers for flow control and isolation purposes to complete their ductwork programme. The ductwork programme ranges in size from 110 mm diameter up to 3000 mm diameter is available in PVC or Polypropylene reinforced where required with GRP, a range of corrosion resistant attenuators and stacks completes the complete system.