A fume hood is the single most expensive piece of equipment in most laboratories — and the most important for safety. Choosing the wrong hood wastes money. Choosing too small wastes money and creates safety risks. This guide walks through every decision point.
Fume Hood Types at a Glance
| Type | Ducted? | Best For | Cost Range |
|---|---|---|---|
| Benchtop Ducted | Yes | Chemistry, general research | $3,500–$8,000 |
| Floor-Mounted (Walk-In) | Yes | Large apparatus, distillation | $8,000–$15,000 |
| Ductless (Filtered) | No | Low-hazard, mobile labs | $2,500–$6,000 |
| Perchloric Acid Hood | Yes | Perchloric acid digestion | $12,000–$20,000+ |
| Radioisotope Hood | Yes | Radioactive materials | $10,000–$18,000 |
| Canopy Hood | Yes | Heat, steam, non-toxic fumes | $1,500–$4,000 |
Step 1: What Are You Working With?
Start by listing every chemical and process that will be performed in the hood. This determines:
- Ducted vs. ductless — Ductless hoods use carbon filters and are only appropriate for specific, low-hazard chemicals. If you work with any volatile organics, strong acids, or carcinogens, you need a ducted hood.
- Hood lining material — Standard epoxy liners handle most chemicals. Polypropylene liners are needed for strong acids. Stainless steel liners are required for perchloric acid.
- Airflow requirements — OSHA recommends a face velocity of 80–120 fpm. Your institutional EHS office may have stricter requirements.
Step 2: Choose the Right Size
Fume hoods are measured by width. Common sizes:
- 4-foot — Adequate for single-researcher use, standard chemistry procedures
- 5-foot — Most popular size, good balance of workspace and footprint
- 6-foot — Recommended for multiple users or large apparatus
- 8-foot — Walk-in or high-capacity applications
Rule of thumb: Buy one size larger than you think you need. Labs always accumulate more equipment over time, and a cramped hood is a safety hazard.
Step 3: Ducted or Ductless?
Read our detailed comparison: Ducted vs. Ductless Fume Hoods. In short:
- Choose ducted if you use volatile organics, strong acids/bases, carcinogens, or any chemical with a PEL below 50 ppm.
- Choose ductless only for known, low-hazard chemicals where filter media is proven effective. Budget for annual filter replacement ($500–$1,500/year).
Step 4: Performance Standards
Every fume hood should be ASHRAE 110 tested. This is the industry standard test that measures containment under controlled conditions. Ask your supplier for:
- ASHRAE 110 test results at the face velocity your lab will operate
- SEFA 1 compliance (construction and performance standards)
- UL 1805 classification (if required by your jurisdiction)
Step 5: Total Cost of Ownership
The purchase price is only 20–30% of a fume hood’s lifetime cost. Factor in:
- HVAC impact — A single ducted hood exhausts 800–1,200 CFM of conditioned air. At $5–$8/CFM annually for HVAC, that is $4,000–$9,600/year per hood.
- Installation — Ductwork, exhaust fans, and electrical typically add 30–50% to the purchase price.
- Maintenance — Annual certification, sash cable replacement, airflow monitor calibration.
- Energy savings options — Variable air volume (VAV) controls can reduce HVAC costs by 40–60%.
Labs USA Fume Hood Options
- Chemistry Fume Hoods — Standard benchtop hoods in 4′, 5′, and 6′ widths
- Quick-Ship Fume Hoods — In-stock hoods shipping in 5–10 days
- Exhaust Snorkels — Point-source extraction for bench-level fumes
- All Fume Hood Products →
Need Help Selecting a Fume Hood?
Our lab design team will review your chemical list and recommend the right hood type, size, and configuration — free of charge.
