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Inlets and Accessories

Size-Selective Inlets, Filter Cartridges, and More
A collection of filter cartridges, size-selective particulate matter inlets, and other accessories for AST air samplers
UPAS with Inlets
UPAS with flow adapter
Photograph of tightening a GEN2 size-selective ilet on the UPAS using the inlet tool

An inlet, filter cartridge, and sample filter are required to collect a particulate matter sample using an Ultrasonic Personal Air Sampler (UPAS) or Home Health Box (HHB).

The following size-selective PM inlets are available for use with our products:

  • PM2.5 @ 1 L min-1
  • PM2.5 @ 2 L min-1
  • Respirable PM @ 2 L min-1
  • PM10/Thoracic @ 2 L min-1.

Cartridges are available for two filter diameters: 37 mm and 25 mm.

Key accessories for size-selective inlets include:

  • Flow check adapter: Seals over the inlet so the sample flow rate can be checked against an external flow meter.
  • Inlet tool: Used to install and remove inlets on a sampler.

 

Technical Resources

Screenshot of first page of size-selective inlets product information sheet

Product Information Sheet

Inlets, cartridges, and accessories, revision 2.7, released May 2026

Download PDF

A screenshot of the cover of the Size-Selective Inlets User Guide

User Guide

Size-Selective Inlet User Guide, revision 3.3, released November 2025

Download PDF

A screenshot of the UPAS Zotero library

Zotero Library

Publications on the design of our UPAS devices and our size-selective inlets

Link to public Zotero library

Relevant blog posts

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Recent related blog posts

General:

UPAS v2.1 - Product information sheet

UPAS v2.1 and v2.1 PLUS - User Guide

Zotero library of publications that feature the UPAS

AST Wiki 

Firmware and app:

UPAS v2.1- iOS mobile device app

UPAS v2.1- Android mobile device app

UPAS v2.1 and v2.1 PLUS - Firmware 

Tools for data analysis:

R Shiny application for data visualization

GitHub: astr R package for working with UPAS log files

 

Related Blog Posts

hut_img1

Measuring Indoor Air Pollution on a Hut Trip with the UPAS v2.1 PLUS

 

 

 

 

Pricing

Our product pricing for customers based in the United States is shown below. Request a quote to receive information about academic and nonprofit discounts. If you're based outside the United States, check to see if your region is covered by one of our distributors and, if so, contact that distributor for country-specific pricing.

Size-selective inlets

Pre-cyclone impactor image

Pre-cyclone impactor

$92.00

For GEN2 PM2.5 1 LPM inlet only. Requires G2P3R1 cyclone insert.

Request quote
Inlet: Respirable 2 LPM. Only available upon special request. image

Inlet: Respirable 2 LPM. Only available upon special request.

GEN2

Request quote
Open-faced inlet image

Open-faced inlet

$167.00

Inlet only; UPAS not included; sample without selecting for a specific particle size; compatible with flow check adapter; requires open-faced filter cartridge

Request quote

Filter cartridges

Open faced image

Open faced

$17.00

37 mm; for use with open-faced inlet only; UPAS not included

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Storage case image

Storage case

$2.00

Polypropylene case for 37- and 25-mm filter cartridges; snaps closed; filter cartridge not included.

Request quote

Tools

Inlet tool image

Inlet tool

$54.00

Required to install and remove GEN2 inlets

Request quote
Flow check adapter image

Flow check adapter

$116.00

Optional: Seal over a GEN2 inlet to connect to an external flow meter and check the sample flow rate

Request quote
Filter cartridge opening tool image

Filter cartridge opening tool

$6.00

Optional: Makes it easier to open filter GEN2 cartridges

Request quote

Charging adapters

UPAS USB charging adapter (US) image

UPAS USB charging adapter (US)

$27.00

USB charging adapter and USB to micro-USB cable. United States wall adapter. Compatible with UPAS v2.0, v2.1, and v2.1 PLUS.

Request quote
UPAS USB charging adapter (EU) image

UPAS USB charging adapter (EU)

$27.00

USB charging adapter and USB to micro-USB cable. European wall adapter. Compatible with UPAS v2.0, v2.1, and v2.1 PLUS.

Request quote

Forms

Photograph of UPAS and accessories with shipping cases

Request a free product demonstration

We can send you hardware to try for a few weeks before you buy. This demonstration is free as long as the product is returned at the end of the demonstration period. No purchase is required.  Fill out and submit this form to request a demonstration unit.
A photograph of a UPAS v2.1 PLUS and UPAS v2.1

Request a quote

Fill out and submit this form to request a quote. It's okay if you still have questions and aren't sure which products and accessories you need. You can enter your questions on the form and we'll get back to you.

Photograph of UPAS v2.0 at workbench

Request service

Have a technical question? Fill out and submit this service request form.