Products Archive - Page 14 of 14 - Connols-Air Pte Ltd

Tunnel Dampers

Description :

OLS Tunnel ventilation damper is constructed of standard hot-dip pre-galvanised steel frame full welded at the corner. The blade is constructed of double-skinned steel plates with stainless steel blade edge seals. Stainless steel jamb seal is installed on the vertical frame to minimise leakage between blade and frame. Damper design enables bi-directional flow. Each blade is equipped with stainless steel stub shaft and pivot on two-parts bearing. Interconnecting blade linkages are located outside the air stream and pivot on stainless steel pin. Damper may be constructed of stainless steel blade and frame. As a standard, on-off spring-return electric actuator or single acting pneumatic actuator is provided to each damper, number of actuator required depend on the torque required to meet pressure and flow requirement. The actuator is fast acting and able to close or open the damper over 90o travel in 10 seconds. Damper may be installed vertically or horizontally.

Features

Robust and modular construction
Double skin air foil blade withstands high torque without twisting at high pressures and velocity
Large module size ensures high free area and lower pressure loss
Square end/round blade stub shaft prevent slip at the actuator clamp
Suitable for Bi-directional flow
Quality assurance tested
Low leakage rate less than 0.5% based on approach velocity of 10 m/s and meets UL555s requirement for Class I damper
Temperature rating of 250°C for 2 hours
Operating pressure to 2700 Pa
Fast cycle time – less than 10s for electric and pneumatic operated damper

Catalogue

Backdraft Damper

Description :

Due to space constraint, backdraft dampers are frequently installed closed to fan discharge in ventilation duct system causing rattling noise and damage to the blade, blade linkage and its bearings. Our engineers at OLS have produced a completely new version of the backdraft damper that is fail-proof and does not cause rattling noise under turbulence flow.

The OLS BD3000 backdraft damper is a twin blade design that pivot on ball-bearing or bronze bushes and does not response to air turbulence like most backdraft dampers. Opening of the damper blade take place with very low pressure and air velocity, 10 Pa and 4 m/s respectively. And air leakage rate in closed position is less than 0.05 m3/s/m2 at 1000 Pa pressure differential not achievable with normal backdraft damper. This damper can be constructed to handle high velocity and pressure ventilation system.

Features

Low pressure required to open damper
Low pressure loss
No rattling noise due to air turbulence.
Low air leakage across closed damper
Ideal for installation in close proximity to fan
Trouble-free operation

Catalogue

Non Return Damper/Pressure Relief Damper

Description :

OLS Non-return damper frame is constructed of high quality hot-dipped pre galvanised steel sheet of 1.20mm thick cold-formed ‘C’ channels. The channels are mechanically fastened and welded at each corner. The standard frame depth is 150mm with 38mm flange for duct to duct connection; other frame depth and flange dimensions are available upon request.

Features

Blade-edge neoprene seal on each blade is provided to minimize air leakage from backflow
Damper may be fitted with counterweight for pressure relief function.
Maximum size of one module damper is 900mm by 1500mm.

Catalogue

Fire Dampers

Description :

OLS Fire dampers are passive fire protection products used in ventilation and air conditioning (ACMV) ducts to prevent the spread of fire through fire-rated walls and floors.

OLS curtain blade fire dampers were subjected to rigorous independent laboratory testing to relevant Australian Standards, British Standard BS476 Part 20, and Part 22, and Singapore Standards SS333. The fire dampers were tested to 4-hour fire resistance in single and multiple-module construction on the wall, floor, and drywall.

Our fire dampers are constructed of heavy gauge galvanized steel and with the option of construction in stainless steel material. Each model of fire damper may be fabricated in 3 variations:

Type A: Curtain blade within the air stream. For use with low-velocity airflow,

Type B: Curtain blade out of airstream for use with low to medium velocity airflow,

Type C: Curtain blade and damper frame entirely out of air stream. This damper offers 100 percent free area to airflow, minimizes pressure drop, and is ideal for medium to the high-velocity system.

Features

Robust construction with heavy gauge hot-dip galvanized steel plate.
Continuous seam weld at all damper sleeve joint ensures product rigidity and closing reliability.
High-quality weld with automatic seam welding prevents rusting.
One mm thick roll-formed blades enable the damper to withstand higher pressure, lower its leakage rate, and improve its closing reliability.
Rigorous fire tests with single and multiple module dampers give a clear indication of small and large dampers' performance.
A large damper module size offers a higher airflow free area resulting in a lower pressure loss.
A large damper module size minimizes air leakage across the blade when closed.
4-hours fire rating provides a higher degree of safety to fire resistance.
Easy installation with sleeve and appropriately sized retaining angles provided.
The damper is modular in construction, and for large size, it is easily assembled on site.
Damper is modular in construction, and for large size, it is easily assembled on site.
The damper is subject to a product certification scheme by a recognized certification body.

With the above features built into the damper and good manufacturing practice, we assure you of a high-quality product, performance, and reliability to keep your property and building occupant safe. Such features enhance the value of a building and keep the fire insurance premium down. For these reasons, the building owner should never compromise on the quality of the fire damper.

Catalogue

Methods of Fire Damper Installation on Drywall

Fire Damper Installation Instructions

Fire Damper Installation on Drywall Supported from Building Structure

Fire Damper Installation on Masonry Wall

Fire Damper Installation on Masonry Floor

Fire Damper Guide Specification

Fire Smoke Dampers

Description :

The Model FSD418 fire smoke damper is constructed of standard hot-dip pre-galvanised steel frame and blade. The blade is constructed of double-skinned steel plates with stainless steel blade edge seals. The vertical frame is constructed of ‘C” channel with 38 or 50 mm flanges for duct connection. Stainless steel jamb seal is installed on the vertical frame to minimise leakage between blade and frame. Damper blade design enables bi-directional airflow. Each blade is equipped with square stainless steel stub shaft and pivot on two-parts bearing. Interconnecting blade linkages are located outside the air stream and pivot on two parts bush. Damper may be constructed of stainless steel blade and frame. As a standard, on-off spring-return electric actuator is provided to each damper, number of actuator required depend on the torque required to meet pressure and flow requirement. The electric actuator is fast acting and able to close or open the damper over 90 degrees travel in 20 seconds.

Features

Robust and high quality construction.
Two-part bearing bush reduce friction, wear and less actuator torque is required.
Double skin Airfoil blade withstand applied torque without twisting at high pressures and velocity resulting in less leakage.
Square blade stub shaft prevent slip at the actuator connection
Suitable for Bi-directional airflow
Quality assurance tested
Low leakage rate less than 0.5% based on approach velocity of 10 m/s and meets UL555s requirement for Class I damper
Fire rating: 4 hours according to BS 476 Part 20
High temperature rating of 250°C for 2 hours
High pressure rating to 1800 Pa
Fast cycling time ensures damper attains the desired blade position promptly

Catalogue

Guide Specification

Tunnel Dampers (SD20)

Description :

The Model SD20 smoke damper is constructed of standard hot-dip pre-galvanised steel frame full welded at the corner. The blade is constructed of double-skinned steel plates with stainless steel blade edge seals. Stainless steel jamb seal is installed on the vertical frame to minimise leakage between blade and frame. Damper design enables bi-directional flow. Each blade is equipped with square stainless steel stub shaft and pivot on two-parts bearing. Interconnecting blade linkages are located outside the air stream and pivot on stainless steel pin. Damper may be constructed of stainless steel blade and frame. As a standard, on-off spring-return electric actuator or single acting pneumatic actuator is provided to each damper, number of actuator required depend on the torque required to meet pressure and flow requirement. The actuator is fast acting and able to close or open the damper over 90o travel in 10 or 20 seconds. Damper may be installed vertically or horizontally.

Features

Robust and modular construction
Double skin Airfoil blade withstand high torque without twisting at high pressures and velocity
Large module size ensures high free area and lower pressure loss
Quality assurance tested
Square blade stub shaft prevent slip at the actuator clamp
Suitable for Bi-directional flow
Low leakage rate less than 0.5% based on approach velocity of 10 m/s and meets UL555s requirement for Class I damper
High temperature rating of 250°C for 2 hours
High pressure rating to 2000 Pa
Fast cycle time – less than 20s for electric actuator and 10s for pneumatic operated damper

Catalogue

Motorized Smoke Dampers (SD20)

Description :

Features

Robust and modular construction
Double skin Airfoil blade withstand high torque without twisting at high pressures and velocity
Large module size ensures high free area and lower pressure loss
Quality assurance tested
Square blade stub shaft prevent slip at the actuator clamp
Suitable for Bi-directional flow
Low leakage rate less than 0.5% based on approach velocity of 10 m/s and meets UL555s requirement for Class I damper
High temperature rating of 250°C for 2 hours
High pressure rating to 2000 Pa
Fast cycle time – less than 20s for electric actuator and 10s for pneumatic operated damper

Catalogue

Motorized Smoke Dampers (SD18)

Description :

The Model SD18 smoke damper is constructed of standard hot-dip pre-galvanised steel frame and blade. The blade is constructed of double-skinned steel plates with stainless steel blade edge seals. The vertical frame is constructed of ‘C” channel with 38 or 50 mm flanges for duct connection. Stainless steel jamb seal is installed on the vertical frame to minimise leakage between blade and frame. Damper blade design enables bi-directional airflow. Each blade is equipped with square stainless steel stub shaft and pivot on two-parts bearing. Interconnecting blade linkages are located outside the air stream and pivot on two parts bush. Damper may be constructed of stainless steel blade and frame. As a standard, on-off spring-return electric actuator is provided to each damper, number of actuator required depend on the torque required to meet pressure and flow requirement. The electric actuator is fast acting and able to close or open the damper over 90 degrees travel in 20 seconds. Pneumatic actuator with a fast acting time of less than 10 seconds may be supplied upon request.

Features

Robust and modular construction
Double skin Airfoil blade withstand high torque without twisting at high pressures and velocity
Large module size ensures high free area and lower pressure loss
Quality assurance tested
Square blade stub shaft prevent slip at the actuator clamp
Suitable for Bi-directional flow
Low leakage rate less than 0.5% based on approach velocity of 10 m/s and meets UL555s requirement for Class I damper
High temperature rating of 250°C for 2 hours
High pressure rating to 2000 Pa
Fast cycle time – less than 20s for electric actuator and 10s for pneumatic operated damper

Catalogue

Jet Fan

Description :

Among all different tunnel ventilation systems, the longitudinal ventilation with jet fans is the most extended one, due to its flexibility and lower cost compared with transverse and semi-transverse ventilation systems using axial fans.

Jet fans can be uni-directional type (our “JZ” series) or fully reversible type (our “JZR” series). The uni-directional jet fans, with asymmetrical blades, are designed to optimise their performance in one direction (forward), while the fully reversible jet fans, with symmetrical blades, are able to achieve the same performance in both directions (forward and reverse).

The jet fans are installed inside the tunnel, either hanging them from the ceiling by means of a suspensions system or placing them on top of small base frames fixed to the lateral walls of the tunnel. Normally suspension system or base frames are also included in ZITRÓN´s scope.

Features

Tested and certifies to operate at high temperature conditions according to Standard EN 12102-3
Anti-corrosive treatments to protect the Fans against corrosion and enlarge their operative life.

Catalogue

Axial Fan

Description :

ZITRÓN has a wide experience in vertical fans, which has been supplied in the most recent tunnel projects world-wide.

According to the design of the tunnel ventilation system, axial fans are commonly used exhausting polluted air and fumes in case of a tunnel fire, but also blowing fresh air inside the tunnel.

Axial fans can be uni-directional type (our “ZVN” series) or fully reversible type (our “ZVR” series). The uni-directional fans are able to reach to 85 % efficiency, while the fully reversible fans can achieve up to 78 % efficiency. In case the uni-directional fans are requested to operate in reverse, their efficiency and performance will be lower than in the forward direction.

Although one stage axial fans are the most commonly used in tunnel and metro ventilation systems, when the pressure requirements are high, two stage fans could be needed.

Features

Tested and certifies to operate at high temperature conditions according to Standard EN 12102-3
Fans can be manufactured either with for horizontal or vertical configurations
Variable pitch blades able to either be hydraulically or electro-mechanically adjusted during operations
able to use in combination with motors suitable for operation over inverter or with motors with one or more speed.

Catalogue