Crispi 4-in-1 Portable Glass Air Fryer Cooking System vs T17021 Family Size Air Fryer: which is safer?
Ninja Crispi 4-in-1 Portable Glass Air Fryer Cooking System is the clear pick. Tower T17021 Family Size Air Fryer carries a failing PFAS grade, and we never recommend buying a failing product.
Our pick
Ninja
Crispi 4-in-1 Portable Glass Air Fryer Cooking System
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleThermal fracture or stress in glass cooking vessel
PossiblePlastic housing off-gassing (VOCs and formaldehyde)
PossibleElectrical hazard or heating element degradation
Tower
T17021 Family Size Air Fryer
PFAS grade
Overall grade
Verdict
Hazard flags
Material
Confidence
PossibleTeflon-type coating fume risk (nonstick coating thermal degradation)
PossibleAluminum leaching from basket substrate
ReportedCoating degradation and longevity
Where these two actually differ
- We flag Thermal fracture or stress in glass cooking vessel, Plastic housing off-gassing (VOCs and formaldehyde) and Electrical hazard or heating element degradation on the Ninja and not on the Tower.
- We flag PTFE fume risk (nonstick coating thermal degradation), Aluminum leaching from basket substrate, Coating degradation and longevity and Lack of materials transparency and recall responsiveness on the Tower and not on the Ninja.
- The Ninja is Glass cooking vessel with stainless steel and plastic components where the Tower is nonstick-coated cooking basket; specific coating composition undisclosed, which is most of the difference in these two grades.
- The gap is 60 points, wide enough that this is not a close call, and the Ninja is the one to buy.
- We are less certain about the Tower grade, at 35% confidence against 75%, because it discloses less.
Both products run through the same public rubric: materials, coatings, brand disclosure, lab findings, and recalls, plus a beyond-PFAS hazard analysis. Grades are model-based estimates, not lab tests. How grades work →
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