---
title: Fan Filter Units in Retrofit Isolation Rooms
description: Airborne infectious isolation rooms are used for patients with highly communicable airborne diseases. Fan Filter Units can be retrofitted into these spaces.
---

[The Science of Comfort - Price Industries HVAC blog](https://blog.priceindustries.com)

# [Fan Filter Units in Retrofit Isolation Rooms](https://blog.priceindustries.com/fan-filter-units-in-retrofit-isolation-rooms)

 Written by [Price Industries](https://blog.priceindustries.com/author/price-industries) | March 31, 2020 at 6:46 PM

## Application of Fan Filter Units in Airborne Infectious Isolation Rooms 

[Airborne infectious isolation rooms](https://www.cdc.gov/infectioncontrol/guidelines/isolation/glossary.html) (AIIRs) are used for patients with easily communicable airborne diseases. When there is a shortage of AIIRs, existing patient rooms (or hotel rooms in temporary care facilities) can be converted to negative pressure isolation rooms. Price [Fan Filter Units](https://www.priceindustries.com/criticalenvironments/products/fan-filter-unit) (FFUs) can be used in three configurations to retrofit these existing spaces.

### Ceiling-Mounted Reverse Flow FFU

In this, the most permanent and involved application, a reverse flow FFU is installed in the ceiling near the patient. Air is drawn from the room, HEPA filtered and then exhausted through existing exhaust/return ductwork.

### Portable Reverse Flow FFU

A reverse flow Fan Filter Unit can be placed on the floor of the patient room and plugged into a standard wall socket, drawing air in through the face of the unit and exhausting HEPA-filtered air out through ductwork that is directed to a room exhaust/return grille, to an adjacent space or out a window. It is important that any openings for ductwork are sealed for leakage to maintain room pressurization.

### Portable Supply Flow FFU

A supply flow FFU can be placed on the floor of a patient room and plugged into a standard wall socket, drawing air through the back of the unit and expelling HEPA-filtered air out through the face of the unit. The FFU should be positioned in an opening in a doorway or wall that is sealed to prevent leakage past the FFU. Alternatively, the FFU can be placed in the doorway between two adjacent rooms (possibly hotel rooms) to create a negative pressure space where the patient is located.

For more information about Fan Filter Units or [Critical Environments products](https://www.priceindustries.com/criticalenvironments/products), please contact us at  
[criticalenvironments@priceindustries.com](mailto:criticalenvironments@priceindustries.com)or visit [pricecriticalenvironments.com](http://pricecriticalenvironments.com).

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