Sentry SPP Rat

Sealed Positive Pressure IVC

The Sentry SPP employs a Sealed Positive Pressure (SPP) system to achieve the type of germ-controlled environment traditionally found only in isolators.

  • Sealed positive pressure IVC system
  • Patented 4-point seal technology
  • Certified double HEPA filtration
  • Ergonomic cage handling, low stress on animals and staff
  • Allentown expert consultation included

Certified double HEPA filtration

Allentown takes the certified HEPA filter from a respected provider, installs it into the SPP rack HEPA assembly and then recertifies the entire system in place. Air passing through the SPP system then passes through a second cage-level HEPA cartridge that itself is certified. As leaders of IVC containment, we know these essential extra steps are vital to your research.

Patented 4-point seal

When you remove a cage from the Allentown SPP system, two ports each on the cage and rack are simultaneously sealed to the room. The Allentown patented 4-point system accomplishes this with quick disconnect couplings, so innovative that it's patented and found nowhere else other than on Allentown housing solutions. US Patent 6,308,660

Ergonomic Leader

Animal and care staff wellbeing being paramount, Allentown designed a smooth and easy cage docking system providing less stress and vibration for research animals and less repetitive motion strain on animal care staff. Proven by an independent ergonomist, the Allentown cage docking system is smooth and easy to use…which is the best choice for your important research.

Cage System with Standard Filter Top
12.750 in x 10.380 in x 17.000 in
324 mm x 264 mm x 432 mm
Floor space: 142 in² | 916 cm²


450 mL
1.12 lbs | 508 g (filled)
Item # PC450BCL+SLC


Standard Filter Top Assembly
11.704 in x 3.190 in x 15.984 in | 2.39 lbs
298 mm x 81 mm x 406 mm | 1084 g
Item # 317114-1


3 in x 5 in Vertical
Item # VH35P3-8
(also available in 3 in x 4 in)
3 in x 5 in Horizontal
Item # HH35P3-8
(also available in 3 in x 4 in)

WBL / Feeder

Full Pocket Wire Bar Lid
Food capacity: 426 g
10.814 in x 3.469 in x 15.093 in | 1.30 lbs
275 mm x 88 mm x 384 mm | 590 g
Item # 231578


Intra-Cage HEPA Filter (Supply)
Item # 230873-CS
Intra-Cage Extract Filter Housing
Item # 115402-1
Intra-Cage Extract Filter
Item # BCU2000PF


Standard Cage
11.214 in x 7.625 in x 15.106 in | 3.15 lbs
285 mm x 194 mm x 384 mm | 1429 g
Item # 231434

All Dimensions Shown (Width x Height x Depth)

Airflow Solutions

Industry leading airflow solutions.

The SPP features an airflow system developed for redundant, high-efficiency containment while also being energy efficient, ergonomically friendly and quiet.


The blower is designed to provide unidirectional single-pass airflow, and being tethered to an occupied cage, accepts real-time data to make automatic adjustments to compensate for both rack HEPA and intra-cage filter loading, ensuring consistent airflow.

Battery Backup

The Battery Backup ensures at least 10 hours of emergency operation of the SPP should there be a facility power failure. Internally, the unit has redundant power supplies, redundant batteries, and a battery charging system to ensure that no "single point of failure" can occur.

Rack HEPA Assembly

The Rack HEPA assembly is hard connected to the racking system, ensuring that all connections to the rack on the "contaminated" side of the filter are securely fastened. The unit features dual (supply and exhaust) HEPA filters and is contains features developed to support containment...such as being able to maintain containment if the blower should ever need to be replaced.


The difference is in the details. Take a closer look.

With more than 50 years worth of experience and expertise in design, engineering and manufacturing, Allentown solutions are not only crafted to perfection, they are also meticulously documented to provide users with all of the information needed to maximize their value. Take a closer look by downloading the data sheet.

Download Data Sheet