Certificates
Waste Electrical and Electronic Equipment (WEEE) compliance
Features
Country of origin	Thailand
Logistics data
Customs product code (TARIC)	3926909790
Harmonized System (HS) code	85389099
Other features
Dimensions (WxDxH)	19 x 19 x 2134 mm
Packaging data
Package dimensions (WxDxH)	245 x 527 x 108 mm
Package weight	580 g
Technical details
Total carbon footprint (kg of CO2e)	2.03549444400032
Compliance certificates	RoHS, REACH, WEEE
Preferred mounting position	no preference
Sustainable packaging
Take-back system
Packaging without single use plastic
Weight & dimensions
Width	19 mm
Depth	19 mm
Height	2134 mm
Weight	250 g

The APC NetShelter SX hot air recirculation prevention kit (type AR7708) is a specific accessory for 19-inch enclosures of the NetShelter SX series. It prevents air recirculation within the enclosure by sealing the ventilation gaps between the vertical mounting flanges and the side covers. This ensures that warm exhaust air from installed IT equipment is not drawn back into the devices, but instead is directed out of the enclosure to the rear. This supports efficient cooling and prevents thermal overload of components.

Applications
This kit is specifically designed for NetShelter SX enclosures requiring optimized airflow. It is used when the front vertical mounting flanges are shifted toward the rear of the enclosure, for example, to create more space for cable routing or other installations. In such cases, gaps are created that can lead to unintended recirculation of warm air. The prevention kit seals these gaps and ensures controlled airflow, supporting the cooling of equipment.

Functions and Equipment in Detail
The kit consists of several components: foam sealing strips and covers for power cable breakers. The sealing strips are attached to the front vertical mounting flanges to close the gaps between the flange and the enclosure wall. The covers for the power cable breakers prevent air from flowing back into the enclosure through the breaker openings. Installation is done by sticking the strips and inserting the covers into the breakers. The instruction manual in the datasheet describes the installation for enclosure heights of 42 HE and 48 HE, with an additional strip required for 48 HE.

Technology Explained Simply
The functionality is based on physically blocking airflow paths. When the mounting flanges are shifted to the rear, gaps are created that can act as unintended air channels. These can carry warm air from the rear section of the enclosure back to the front sections, where the equipment draws in air. The kit seals these channels using the sealing strips and covers, ensuring that air is only directed out through the intended path — through the enclosure to the rear. This is particularly important to maintain equipment cooling performance and minimize thermal stress.

Compatibility and Accessories
The kit is exclusively intended for APC NetShelter SX enclosures. It is designed for enclosure heights of 42 HE and 48 HE, with the installation manual specifying adjustments for 48 HE. The components are designed for the front vertical mounting flanges.

Installation and Mounting
Installation is carried out in several steps: First, the side covers of the enclosure are removed to gain access to the mounting flanges. The sealing strips are attached to the front mounting flanges, maintaining a 6 mm gap between the side clamp and the strip to avoid damage. Then, the side walls are reinserted and locked. The covers for the power cable breakers are inserted into the corresponding openings. For equipment with side airflow requirements, the strips and covers must be positioned on the air intake side of the enclosure to ensure airflow to the equipment.

Operational Benefits
Using the kit contributes to the thermal stability of installed IT equipment. By preventing air recirculation, the cooling effect of fans and air conditioning units within the enclosure is optimized. This can extend the lifespan of devices and reduce failure risks due to overheating. Installation is simple and requires no special tools. The components are made of lightweight material (weight 250 g) and are designed to fit the dimensions of NetShelter SX enclosures (19 x 19 x 2134 mm). Compliance with RoHS, REACH, and WEEE demonstrates adherence to European environmental standards.