Custom Products Overview
Xpelair CustomVent Division specializes in creating bespoke ventilation solutions for challenging applications globally. Some custom designs evolve into series production units, such as Combi units and Flex CMAX units, recognized for their integrated damped panel technology and noise sensitivity.

Manufacturing Standards
Products are manufactured in Peterborough and Southampton adhering to ISO 9001:2000 standards, ensuring high-quality air-handling units with capabilities up to 14m3/s, including commissioning services.

Performance Data
Detailed performance data is provided for various models, including airflow rates, fan speeds, and motor specifications.

Controllers and Accessories
Includes wiring diagrams and options for speed controllers, terminal boxes, and various ducting accessories.

Procedures
Air handlers are designed for easy installation with slotted safety mounting points and integral fan mountings. Speed selection is facilitated by multi-tapped auto-transformers, allowing for five-speed adjustments. Optional terminal boxes are available for electrical connections.

Key Features
Xpelair air handlers are designed for efficiency, noise reduction, and ease of installation. They are suitable for ceiling or floor void applications and can be paired with twin fans for ventilation purposes. The entrance air curtains offer protection from draughts and energy savings, with a unique speed selector system and 'AirBlade' discharge for high-velocity protection.

Recommendations
The document recommends using appropriate filters and heating coils based on system requirements. It also suggests considering noise levels and airflow rates when selecting a model for specific applications.

Specifications for Xpelair Dunes Duo Twin XDRD Series
The XDRD series fans are designed with high efficiency, low noise, and forward-curved impellers housed in galvanized steel scrolls. The motor and impeller assemblies are balanced according to BS 5265 Part 1 1979 standards to G2.5. The fans are mounted on fan decks for easy removal.

Motors
The motors are totally enclosed, high efficiency, split-capacitor external rotor types with power factors better than 0.9. They can operate in ambient temperatures up to 50ºC and have sealed, maintenance-free ball bearings with a life expectancy of 50,000 hours. The motors include auto-resetting thermal contactors for overload protection and are insulated to Class F with an IP44 or IP54 enclosure.

Application and Features
The XDRD series is designed for roof installations where space and access are limited. They are suitable for environments with abrasive dust, coastal salt-water humidity, and high temperatures. These fans are ideal for applications requiring duty standby fans, such as kitchens, restaurants, hotels, and other commercial spaces.

Performance Data
Detailed performance data for various models (XDRD150, XDRD250/1, XDRD250/2, XDRD315, XDRD600/1, XDRD600/2) is provided, including airflow rates at different static pressures, nominal fan speeds, maximum electrical power, full load and starting currents, motor insulation class, IP rating, maximum operating temperature, and weight.

Sound Power Data
Sound power levels are provided for each model across different frequencies (63Hz to 8kHz) and overall dB(A) at 3 meters.

Controllers and Wiring Diagrams
The document describes the MAC-M manual duty sharing controller with auto changeover and the ACO automatic duty sharing controller. These controllers allow for manual or automatic selection of duty and standby fans, with indicators for power, run, and fail status.

Accessories
A range of accessories is listed, including inline duct bag filters, circular silencers, flexible connections, solid ducts, louvre shutters, and various grille options.