AXO

AXO-TWIN

Dual Flow High Induction Swirl Diffuser for VAV Systems

Description Documents Specifications Video

AXO-TWIN Dual Flow High Induction Diffuser for VAV Systems

01 / 07 Products

Taking high induction diffusers to the next level

AXO-TWIN Dual Flow High Induction Swirl Diffuser is designed to achieve greater air mixing, thermal comfort and energy efficiency in VAV installations.

AXO-TWIN provides an optimal performance for air volumes varying between 70 cfm and 320 cfm.

Thanks to the innovative and patent pending design of its dual chamber plenum, AXO-TWIN diffuser self-adjusts in order to let the air pass through more or fewer induction vanes based on the volume of air, resulting in a more stable performance in VAV applications.

At low cfm, the air is diffused through the outer circle of induction vanes. At high cfm, the inner chamber opens and the air is diffused through the entire surface of the diffuser.

The adjustment is completely autonomous and doesn’t require any special configuration, controls nor electricity.

The direct outcome is a more stable throw, air velocity, induction ratio and NC in VAV applications.

Downloads

Request a quote Design in SelectiV

Description

AXO-TWIN Dual Flow High Induction Swirl Diffuser by EffectiV and MADEL® is designed to achieve greater air mixing, thermal comfort and energy efficiency in VAV installations.

AXO-TWIN provides an optimal performance for air volumes varying between 70 cfm and 320 cfm

The direct outcome is a more stable throw, air velocity and induction ratio in VAV applications.

When designing a system, engineers select diffusers based on maximum air volume, trying to reach the occupied zone with limited air velocity to properly mix the room air while avoiding thermal discomfort. When VAV systems supply lower air volumes, however, the diffusion performance is seriously affected. At lower velocity, cold air tends to drop from the ceiling and hot air tends to stick to the ceiling. Hot and cold spots are created in the room and the air may fail to reach to occupied zone. Energy consumption and occupants’ comfort are automatically impacted. The lack of air mixing may also increase the concentration of contaminants – CO2, gases, viruses and other airborne particles – accumulated in the room’s air.

With AXO-TWIN, we limit the diffuser’s free area in order to ensure enough discharge velocity to maintain a higher discharge velocity, a higher induction ratio and more stable throw distances at low cfm.

The ultimate benefits are: significantly increased thermal comfort, energy efficiency, and improved ventilation for indoor air quality.

The high induction vanes and pressurization of the air in the plenum create a very even swirl diffusion pattern by default. The vanes are individually adjustable to make it possible to adapt the airflow.

AXO-TWIN diffusers allow an optimal performance despite flow variations of up to 75% while keeping the air stream stable. For optimal conditions, AXO- TWIN diffusers may be used in ceilings 8.5 up to 13 feet (2.6 up to 4 meters) high, with a temperature differential up to 27ºF (15ºC).

With AXO-TWIN, we’re taking high induction diffusers to the next level.

Specifications

23 37 XX – High Performance Architectural Diffusers

AXO-TWIN – Dual Flow High Induction Swirl Diffusers for VAV Systems (with dual-chamber plenum)

Guide specification text for specifiers. The PDF is the reference document.

Read the specification

PART 1 – GENERAL

1.1 SUMMARY

A. Dual-flow high induction swirl supply diffuser(s) for VAV systems, self-adjusting to maintain more constant throw, discharge velocity, induction behavior, and diffuser-generated NC over a wide operating range.

B. Self-adjusting operation shall be fully autonomous, requiring no controls and no electricity. At low airflow, air shall discharge through the outer induction vane ring; at higher airflow, an inner chamber shall open to discharge through the full diffuser area.

C. Operating range: Provide optimal performance for air volumes between 70 and 320 cfm; diffuser shall maintain stable performance with flow variations up to 75%.

D. Application limits: Suitable for ceilings 8.5 to 13 ft (2.6 to 4.0 m) and temperature differential up to 27°F (15°C), unless otherwise indicated.

E. Installation clearance: Unit shall require a maximum of 12 in ceiling void height for installation.

1.2 SUBMITTALS

A. Product Data: Manufacturer’s data for scheduled size(s) and airflow, including:

Recommended minimum and maximum airflow for VAV operation.
Pressure loss and diffuser-generated NC.
Throw data (with and without ceiling effect, where published) and any published correction factors.
Induction ratio data (where published), including the basis for diffusion pattern (Type A / Type B where applicable).
Construction description of the dual-chamber plenum and autonomous self-adjusting mechanism.

B. Shop Drawings: Show unit dimensions, neck/connection size and location, required ceiling height, diffuser face finish, vane color selection, and installation details.

C. Airflow Prediction Report (Required): Provide manufacturer-generated room airflow prediction report for each diffuser type and unique room condition using manufacturer performance data and recognized correction methods. Report shall include:

3D room layout with diffuser placement.
Predicted airflow visualization views: plan (top), section (side), elevation (front).
Throw distances for terminal velocities of 150, 100, 60, 50, 40, 30, and 20 fpm.
Pressure loss at scheduled airflow.
Diffuser-generated NC.
Perceived NC at room center (5 ft height), 63–8000 Hz octave bands; include assumptions used.

D. Verified CFD Validation (When Indicated): Provide EffectiV Verified CFD validation and summary report for spaces indicated and/or when operation is outside published selection limits.

1.3 SUBSTITUTIONS

A. Substitutions per Division 01.

B. Proposed equals shall provide a line-by-line compliance matrix including all Part 1 deliverables and confirmation of:

Autonomous dual-flow self-adjusting operation (no controls/electricity).
Dual-chamber plenum construction and mechanism.
Published performance coverage for VAV range stated in 1.1.

PART 2 – PRODUCTS

2.1 BASIS OF DESIGN

A. EffectiV AXO-TWIN dual flow high induction swirl diffuser for VAV systems.

2.2 SIZE AND AIRFLOW

A. Diffuser face size: nominal 24 in x 24 in class (actual dimensions as published by manufacturer).

B. Recommended airflow range: 70 to 320 cfm (recommended for optimal performance; may be exceeded where permitted by design).

2.3 MATERIALS AND CONSTRUCTION

A. Diffuser face: galvanized steel, factory powder coated TGIC-free, white M9016 unless otherwise scheduled.

B. Induction vanes: individually adjustable ABS diffusion vanes; provide airflow straighteners on the back of the vanes to ensure consistent discharge and swirl pattern.

C. Induction vane color: black or white, as scheduled.

D. Plenum: galvanized steel dual-chamber plenum with polymeric membrane that allows air access to the inner chamber at higher airflow, enabling autonomous dual-flow operation.

E. Gasket: provide gasket on back of diffuser to ensure airtight contact with plenum.

2.4 PERFORMANCE REQUIREMENTS

A. Provide diffuser capable of maintaining stable performance in VAV applications by limiting effective free area at low airflow and opening additional free area at higher airflow to stabilize discharge characteristics.