Project Overview

Extechnology delivered a high-efficiency electrostatic filtration solution to support the Hoxton Hotel’s busy food and beverage operation in Holborn. The system was designed to provide reliable grease and particulate removal across extended operating hours, while maintaining low and predictable static pressure to support efficient fan operation and simplified maintenance.

Washable ESP cells and modular filtration stages were selected to ensure long-term performance with reduced reliance on consumable components, supporting the hotel’s operational and maintenance requirements.

The Challenge

The Hoxton Hotel operates multiple food concepts within a single hospitality environment, resulting in consistently high particulate loads and variable cooking profiles throughout the day. Long service hours placed increased demands on system reliability, filtration efficiency, and service access.

Key challenges included:

• Managing high grease and smoke production from multiple kitchens

• Maintaining low system resistance to protect fan performance

• Achieving predictable and manageable service intervals

• Minimising ongoing consumable and maintenance costs

The Solution

Extechnology engineered a multi-stage ESP filtration system using modular ESP banks sized to maintain 95%+ particulate capture when correctly applied. The system was designed to operate at appropriate face velocities, ensuring effective dwell time through the ESP cells without introducing unnecessary pressure losses.

Washable pre-filters and ESP cells were incorporated to remove larger particulates upstream and enable routine cleaning, significantly reducing consumable replacement costs and downtime.

Provision was included within the system layout for future reinforcement of odour control through the addition of in-duct UV-C treatment (iDUCT) and activated carbon polishing, allowing the system to adapt to changing operational or planning requirements.

Technology Used

• RY5000B / RY7500B Electrostatic Precipitators configured in modular banks

• Washable pre-filters and ESP cells for reduced lifecycle cost

• Optional iDUCT UV-C in-duct arrays for odour treatment

• Activated carbon filtration as a final polish or ozone quench where required

Project Outcomes

• Stable and reliable system operation under high particulate loading

• Low pressure drop maintained across all filtration stages

• Improved cleanliness of downstream ductwork and fan assemblies

• Reduced fire risk and simplified compliance with TR19 duct cleaning requirements

• Predictable service regime based on visual inspection, differential pressure monitoring, and periodic washing

Consultant Notes

ESP housings were specified with reverse-airflow capability to provide flexibility during installation and future system adjustments. BMS terminals and monitoring points were included to support remote performance monitoring, alarm indication, and planned maintenance management.