1. Understanding of the envelope (unknown)
Key exam domainIdentify weak areas and improve with focused review.
Start PracticingPass your CDET certification
Free CDET Practice Test
Pass the Certified Duct and Envelope Testing exam with confidence.
Start with a free CDET practice test and build exam-ready confidence for the Certified Duct and Envelope Testing exam.
No signup to begin
No credit card
Instant scoring
1000+CDET Questions
5Exam Domains
10Free Questions
2026Updated
Question 1 of 10
What you get
Everything your CDET certification prep needs
Practice expert-vetted questions, find your weak domains, and turn every mistake into a focused review plan.
Expert-vetted questions
Every question is reviewed by an experienced CDET professional for clarity, accuracy and practical exam relevance.
See what to study next
Domain analytics show which parts of the exam blueprint are holding you back.
Turn mistakes into confidence
Missed questions become a review list, so nervous guessing turns into focused repetition.
Know where you stand
Your exam readiness
Track your readiness, domain strengths, and recent results at a glance.
Your exam readiness
--%Ready
Keep practicing to build consistency and confidence.
Domain performance
Recent quiz performance
Recommended study plan
Your daily goal
20 questions
Current streak
0 🔥
0 / 20 completed
Keep it going! Consistency is the key to passing.
Your progress at a glance
0%Overall score
0Questions answered
0%Avg. accuracy
This is a preview of your analytics
Track your real exam readiness, weak domains, and quiz history with Fast Track and Pass Confidence.
Study by domain
Practice the CDET exam by domain
2. Duct leakage testing procedures (unknown)
Key exam domainIdentify weak areas and improve with focused review.
Start Practicing3. Envelope (structure) testing procedures (unknown)
Key exam domainIdentify weak areas and improve with focused review.
Start Practicing4. Methods expressing results (unknown)
Key exam domainIdentify weak areas and improve with focused review.
Start Practicing5. Terminology (unknown)
Key exam domainIdentify weak areas and improve with focused review.
Start PracticingChoose your prep window
Pick the plan that matches your exam date
Tell us when your exam is and the plan that fits lights up. Every plan unlocks the full question bank; analytics and longer access scale with your timeline.
When is your exam?
Secure checkout
Your payment is safe and encrypted
Instant access after payment
Start practicing right away
One-time payment, no recurring billing
Pay once, access until your plan expires
Before you decide
Frequently asked questions
Straight answers about the CDET exam, the questions, pricing, the free trial, and how this fits your prep.
The CDET exam spans 5 domains - Understanding of the envelope (unknown), Duct leakage testing procedures (unknown), Envelope (structure) testing procedures (unknown), Methods expressing results (unknown), and Terminology (unknown). Every practice question maps to one of them, so you train on exactly what's tested.
No - and that matters. These are original practice questions written to mirror the style, difficulty, and domain coverage of the CDET exam blueprint. We never distribute actual exam content, so practicing here keeps you fully compliant with official exam policies.
No. CDET Exam Prep is an independent study resource for Certified Duct and Envelope Testing (CDET). It is not affiliated with, sponsored by, or endorsed by the official certifying body or exam administrator.
Every paid plan unlocks the full bank of 1,000+ practice questions covering all 5 CDET domains - Understanding of the envelope (unknown), Duct leakage testing procedures (unknown), Envelope (structure) testing procedures (unknown), Methods expressing results (unknown), and Terminology (unknown). You can practice the whole bank, filter by domain, or run a timed, domain-balanced exam simulation.
Yes - the bank is maintained against the current exam outline, and questions are revised when the exam changes.
No honest practice platform can guarantee a pass. What realistic practice does is show you - before exam day - exactly which domains are weak, and give you the repetitions to fix them. That's the difference between hoping you're ready and knowing where you stand.
Yes. You get 10 free sample questions with instant feedback - no credit card and no account required.
The free sample shows you the question quality. Paid plans unlock the full 1,000+ question bank, exam-style practice modes, mistake review, and - on Fast Track and Pass Confidence - progress analytics that show your readiness by domain.
No. Every plan is a single one-time payment for a fixed access window - 48 hours, 7 days, or 6 weeks. There is no auto-renewal and no recurring billing.
Match it to your exam date: Final Review (2 days) for an exam in the next day or two, Fast Track (7 days) for an exam this week, Pass Confidence (6 weeks) for a structured run-up.
For most countries, the price you see is exactly what you pay - tax is already included. Where local law requires it to be added separately, it's shown clearly at checkout before you pay, so there are never any surprise fees.
Access is instant after payment and runs for your plan's full window from that moment. When the window ends, your local progress stays on your device - you can buy another window any time and pick up where you left off.
Yes - the whole platform is mobile-first: practice, mistake review, and analytics all work on any phone, tablet, or laptop with a browser. Nothing to install.
Every answer feeds your per-domain accuracy, readiness score, and weak-area list. Instead of re-reading everything, you drill the domains that are actually costing you points - that's what moves a score in days, not months.
Chat with us any time - the 24/7 support chat in the corner of every page gives instant answers about plans, access, and billing. Prefer email? The contact link is in the footer. Payments are processed securely by Stripe, and active customers can download an invoice from their profile page.
Make sure you're signed in with the same email you used at checkout - access activates within a minute of payment. If it still doesn't appear, email us from the contact link in the footer and it'll be sorted out.
Ready to test your CDET knowledge?
Start your free 10-question practice test now and get instant results.
No credit card required
Ready to pass your CDET exam?
Unlock full-length timed mock exams and domain analytics to find and fix your weak spots before exam day.
1,000+ exam-style questions in every plan
Practice workspace
How do you want to practice CDET today?
Drill a single domain, run a mixed session, or sit a full timed exam simulation - pick the mode that fits your study window.
Study by domain
Focus on one CDET domain at a time - pick it here, then choose a mode.
Popular ways to practice
Quick Practice
Jump straight in with a fast mixed session - perfect for a short study break.
Start quick practice →Domain Practice
Drill the domain selected above and close the gaps where they matter most.
Practice this domain →Exam Simulation
A full-length timed exam that mirrors the real CDET test, balanced across every domain.
Start simulation → Unlock with Fast Track & Pass Confidence
More ways to practice
Flashcards
Flip, grade yourself, and repeat the tough ones until they stick.
Train with flashcards →Review Mistakes
Re-drill the questions you got wrong.
Review now →Review Weak Domains
Drill your lowest-scoring domains first.
Find weak spots →All Questions
The complete CDET question bank.
Browse all →Multiple Choice
Multiple-choice questions only.
Start →True / False
True/false questions only.
Start →
New here? Start with Quick Practice for a warm-up, or sit the Exam Simulation for the most realistic test-day feel.
Question 1 of 50
Question will appear here
Feedback will appear here
Quiz Complete!
Review your performance and keep improving
0%
Final Score
0
Questions Answered
0
Correct
0
Incorrect
Performance Breakdown
Answer Distribution
Questions to Review
Review Your Mistakes
Domain Performance Analysis
All Mistakes
Flashcards
Train your CDET recall
Flip a card, grade yourself honestly, and the deck keeps bringing back the ones you're still learning until they stick.
Deck size
Question
Tap or press space to flip
Answer
Deck complete
0
Cards mastered
0
Extra reviews needed
0%
Known first try
Choose the right CDET prep plan
Pick based on how soon your exam is. Every plan includes exam-style questions, instant explanations, and one-time access.
When is your exam?
Last-minute review
Final Review
$19.95 USD
$29.95Save 33%Limited time
One-time payment
≈ $9.97 per day of access
48-hour access
A focused 48-hour cram for candidates sitting the exam in the next day or two.
- Full 1,000+ question bank
- All 5 CDET domains
- Multiple-choice & true/false practice
- 48 hours of unlimited practice
- Analytics & mistake review
Exam this week
Fast Track
$49.95 USD
One-time payment
≈ $7.14 per day of access
7-day access
A focused one-week study push with full progress analytics.
- Ensure success with analytics & mistake review
- Everything in Final Review
- Full-length timed exam simulation
- Progress & accuracy tracking
- Domain weakness analysis
- Quiz history & trends
Recommended
Pass Confidence
$129.95 USD
One-time payment
Just $3.09/day · best long-term value
★ 2.6× more likely to pass first time
6-week access
For candidates with 2-6 weeks before exam day - the complete, confident way to prepare.
- Ensure success with analytics & mistake review
- Everything in Fast Track
- 6 full weeks of access
- Exam-readiness scoring
- Priority Support
Secure checkout
Your payment is safe and encrypted
Instant access after payment
Start practicing right away
One-time payment, no recurring billing
Pay once, access until your plan expires
Account profile
Profile and invoices
Keep billing details ready for receipts and confirm the access tied to your CDET prep account.
Free access
No active plan
Upgrade to unlock invoice downloads.
Access
Account
Not signed in
Plan
Free practice
Status
Inactive
Access until
-
Invoice amount
-
Invoice details are generated from your saved profile and current access plan.
Exam details
Your exam date helps pace your prep. It is saved to your account and visible only to you.
Preferences
Theme
System follows your device setting.
Auto-advance
Move to the next question about a second after a correct answer.
Vibration feedback
A subtle buzz on answers, on phones that support it.
Reset local progress
Clears practice history and stats on this device. Your account and purchases are not affected.
Your CDET Prep Progress
Track your mastery across all CDET domains
0 / 1000
Questions Seen
0
Quiz Attempts
0x
Avg Reviews/Question
0
Correct Answers
0%
Overall Accuracy
Performance Distribution
Progress Over Time
Domain Mastery (Accuracy %)
See which domains are dragging your score
Your per-domain accuracy is ready - unlock it to focus your studying.
Weekly Activity
Recent Quiz History
Unlock your full readiness picture
Domain mastery, weak-area drilling, and quiz-history trends - included with Fast Track & Pass Confidence.
Trusted by CDET candidates
Real feedback from CDET candidates on Reddit.
"put off studying for like 3 weeks then crammed the last few days on cdettest.com. the practice questions on duct leakage testing saved me, that was the part i knew least. passed, barely remember the drive home."
"honestly wasnt sure this was gonna help, figured id just wing the hands on part since ive done blower door stuff for years. but the terminology section actually cleared up a bunch of words i was using wrong this whole time. passed both parts first try."
"failed a practice test the first time and almost gave up ngl. went back thru the mistake review feature a couple times, focused on envelope testing procedures since i kept missing those. retook it and finaly passed the written no problem."